diff --git a/MCInst.c b/MCInst.c
index 933327a468..e7bf3384b9 100644
--- a/MCInst.c
+++ b/MCInst.c
@@ -288,7 +288,7 @@ uint64_t MCInst_getOpVal(MCInst *MI, unsigned OpNum)
 void MCInst_setIsAlias(MCInst *MI, bool Flag) {
 	assert(MI);
 	MI->isAliasInstr = Flag;
-	MI->flat_insn->is_alias = Flag;
+	CS_INSN_FLAGS_SET(MI->flat_insn, Flag, CS_INSN_FLAG_ALIAS);
 }
 
 /// @brief Copies the relevant members of a temporary MCInst to
diff --git a/Mapping.c b/Mapping.c
index aff6f2f5f6..fe3c2cfcb5 100644
--- a/Mapping.c
+++ b/Mapping.c
@@ -363,7 +363,7 @@ void map_set_fill_detail_ops(MCInst *MI, bool Val) {
 void map_set_is_alias_insn(MCInst *MI, bool Val, uint64_t Alias) {
 	assert(MI);
 	MI->isAliasInstr = Val;
-	MI->flat_insn->is_alias = Val;
+	CS_INSN_FLAGS_SET(MI->flat_insn, Val, CS_INSN_FLAG_ALIAS);
 	MI->flat_insn->alias_id = Alias;
 }
 
diff --git a/arch/AArch64/AArch64Mapping.c b/arch/AArch64/AArch64Mapping.c
index 6db42a21f5..824ce8283f 100644
--- a/arch/AArch64/AArch64Mapping.c
+++ b/arch/AArch64/AArch64Mapping.c
@@ -423,7 +423,7 @@ static void AArch64_add_not_defined_ops(MCInst *MI, const SStream *OS)
 	if (!detail_is_set(MI))
 		return;
 
-	if (!MI->flat_insn->is_alias || !MI->flat_insn->usesAliasDetails) {
+	if (!CS_INSN_FLAGS_ALL(MI->flat_insn, CS_INSN_FLAG_ALIAS | CS_INSN_FLAG_ALIAS_DETAILS)) {
 		add_non_alias_details(MI);
 		return;
 	}
@@ -539,7 +539,7 @@ void AArch64_printer(MCInst *MI, SStream *O, void * /* MCRegisterInfo* */ info)
 	MCRegisterInfo *MRI = (MCRegisterInfo *)info;
 	MI->MRI = MRI;
 	MI->fillDetailOps = detail_is_set(MI);
-	MI->flat_insn->usesAliasDetails = map_use_alias_details(MI);
+	CS_INSN_FLAGS_SET(MI->flat_insn, map_use_alias_details(MI), CS_INSN_FLAG_ALIAS_DETAILS);
 	AArch64_LLVM_printInstruction(MI, O, info);
 	if (detail_is_set(MI))
 		AArch64_get_detail(MI)->post_index = AArch64_check_post_index_am(MI, O);
diff --git a/arch/ARM/ARMMapping.c b/arch/ARM/ARMMapping.c
index beb0214a02..d71aac4ae0 100644
--- a/arch/ARM/ARMMapping.c
+++ b/arch/ARM/ARMMapping.c
@@ -257,7 +257,7 @@ static void ARM_add_not_defined_ops(MCInst *MI)
 	if (!detail_is_set(MI))
 		return;
 
-	if (MI->flat_insn->is_alias && MI->flat_insn->usesAliasDetails) {
+	if (CS_INSN_FLAGS_ALL(MI->flat_insn, CS_INSN_FLAG_ALIAS | CS_INSN_FLAG_ALIAS_DETAILS)) {
 		add_alias_details(MI);
 		return;
 	}
@@ -596,7 +596,7 @@ void ARM_printer(MCInst *MI, SStream *O, void * /* MCRegisterInfo* */ info)
 	MCRegisterInfo *MRI = (MCRegisterInfo *)info;
 	MI->MRI = MRI;
 	MI->fillDetailOps = detail_is_set(MI);
-	MI->flat_insn->usesAliasDetails = map_use_alias_details(MI);
+	CS_INSN_FLAGS_SET(MI->flat_insn, map_use_alias_details(MI), CS_INSN_FLAG_ALIAS_DETAILS);
 	ARM_LLVM_printInstruction(MI, O, info);
 	map_set_alias_id(MI, O, insn_alias_mnem_map, ARR_SIZE(insn_alias_mnem_map) - 1);
 	ARM_add_not_defined_ops(MI);
diff --git a/arch/PowerPC/PPCMapping.c b/arch/PowerPC/PPCMapping.c
index 2d11674389..58f9aad098 100644
--- a/arch/PowerPC/PPCMapping.c
+++ b/arch/PowerPC/PPCMapping.c
@@ -223,7 +223,7 @@ void PPC_printer(MCInst *MI, SStream *O, void * /* MCRegisterInfo* */ info)
 {
 	MI->MRI = (MCRegisterInfo *)info;
 	MI->fillDetailOps = detail_is_set(MI);
-	MI->flat_insn->usesAliasDetails = map_use_alias_details(MI);
+	CS_INSN_FLAGS_SET(MI->flat_insn, map_use_alias_details(MI), CS_INSN_FLAG_ALIAS_DETAILS);
 	PPC_LLVM_printInst(MI, MI->address, "", O);
 	map_set_alias_id(MI, O, insn_alias_mnem_map,
 			 ARR_SIZE(insn_alias_mnem_map));
diff --git a/bindings/python/capstone/__init__.py b/bindings/python/capstone/__init__.py
index 154e6f1105..83bb554a26 100755
--- a/bindings/python/capstone/__init__.py
+++ b/bindings/python/capstone/__init__.py
@@ -355,6 +355,11 @@
 CS_OPT_SYNTAX_MOTOROLA = 1 << 6  # MOS65XX use $ as hex prefix
 CS_OPT_SYNTAX_CS_REG_ALIAS = 1 << 7  # Prints common register alias which are not defined in LLVM (ARM: r9 = sb etc.)
 
+# Instruction flags
+CS_INSN_FLAG_ALIAS = 1 << 0
+CS_INSN_FLAG_ALIAS_DETAIL = 1 << 1
+CS_INSN_FLAG_ARCH_MASK = 0xfff00000
+
 # Capstone error type
 CS_ERR_OK = 0      # No error: everything was fine
 CS_ERR_MEM = 1     # Out-Of-Memory error: cs_open(), cs_disasm()
@@ -492,14 +497,13 @@ class _cs_detail(ctypes.Structure):
 class _cs_insn(ctypes.Structure):
     _fields_ = (
         ('id', ctypes.c_uint),
+        ('flags', ctypes.c_uint),
         ('alias_id', ctypes.c_uint64),
         ('address', ctypes.c_uint64),
         ('size', ctypes.c_uint16),
         ('bytes', ctypes.c_ubyte * 24),
         ('mnemonic', ctypes.c_char * 32),
         ('op_str', ctypes.c_char * 160),
-        ('is_alias', ctypes.c_bool),
-        ('usesAliasDetails', ctypes.c_bool),
         ('detail', ctypes.POINTER(_cs_detail)),
     )
 
diff --git a/bindings/python/pyx/ccapstone.pxd b/bindings/python/pyx/ccapstone.pxd
index 176dd43b20..6d091966c5 100644
--- a/bindings/python/pyx/ccapstone.pxd
+++ b/bindings/python/pyx/ccapstone.pxd
@@ -13,19 +13,23 @@ cdef extern from "<capstone/capstone.h>":
     ctypedef enum cs_arch:
         pass
 
+    ctypedef enum cs_insn_flags:
+        is_alias "CS_INSN_FLAG_ALIAS" = 1 << 0
+        usesAliasDetails "CS_INSN_FLAG_ALIAS_DETAILS" = 1 << 1
+        archMask "CS_INSN_FLAG_ARCH_MASK" = 0xfff00000
+
     ctypedef struct cs_detail:
         pass
 
     ctypedef struct cs_insn:
         unsigned int id
+        cs_insn_flags flags
         uint64_t alias_id;
         uint64_t address
         uint16_t size
         uint8_t bytes[24]
         char mnemonic[32]
         char op_str[160]
-        bool is_alias;
-        bool usesAliasDetails;
         cs_detail *detail
 
     ctypedef enum cs_err:
diff --git a/cs_priv.h b/cs_priv.h
index c4866ddfd5..5d03be5301 100644
--- a/cs_priv.h
+++ b/cs_priv.h
@@ -109,4 +109,12 @@ extern cs_vsnprintf_t cs_vsnprintf;
 #define CS_ASSERT(expr)
 #endif
 
+/// Set flags if condition is true or clear flags.
+#define CS_INSN_FLAGS_SET(INSN, COND, FLAGS) \
+	if (COND) { \
+		(INSN)->flags |= FLAGS; \
+	} else { \
+		(INSN)->flags &= ~(FLAGS); \
+	}
+
 #endif
diff --git a/cstool/cstool.c b/cstool/cstool.c
index 795850840f..15278df485 100644
--- a/cstool/cstool.c
+++ b/cstool/cstool.c
@@ -354,9 +354,9 @@ static void usage(char *prog)
 static void print_details(csh handle, cs_arch arch, cs_mode md, cs_insn *ins)
 {
 	printf("\tID: %u (%s)\n", ins->id, cs_insn_name(handle, ins->id));
-	if (ins->is_alias) {
+	if (ins->flags & CS_INSN_FLAG_ALIAS) {
 		printf("\tIs alias: %" PRIu64 " (%s) ", ins->alias_id, cs_insn_name(handle, ins->alias_id));
-		printf("with %s operand set\n", ins->usesAliasDetails ? "ALIAS" : "REAL");
+		printf("with %s operand set\n", ins->flags & CS_INSN_FLAG_ALIAS_DETAILS ? "ALIAS" : "REAL");
 	}
 
 	switch(arch) {
diff --git a/include/capstone/capstone.h b/include/capstone/capstone.h
index 55610fbce1..1543ecd6ca 100644
--- a/include/capstone/capstone.h
+++ b/include/capstone/capstone.h
@@ -440,6 +440,21 @@ typedef struct cs_detail {
 	};
 } cs_detail;
 
+/// Instruction flags.
+typedef enum cs_insn_flags {
+	/// True: This instruction is an alias.
+	/// False: Otherwise.
+	/// -- Only supported by auto-sync archs --
+	CS_INSN_FLAG_ALIAS = 1 << 0,
+
+	/// True: The operands are the ones of the alias instructions.
+	/// False: The detail operands are from the real instruction.
+	CS_INSN_FLAG_ALIAS_DETAILS = 1 << 1,
+
+	/// Mask for architecture specific flags.
+	CS_INSN_FLAG_ARCH_MASK = 0xfff00000,
+} cs_insn_flags;
+
 /// Detail information of disassembled instruction
 typedef struct cs_insn {
 	/// Instruction ID (basically a numeric ID for the instruction mnemonic)
@@ -450,6 +465,9 @@ typedef struct cs_insn {
 	/// NOTE: in Skipdata mode, "data" instruction has 0 for this id field.
 	unsigned int id;
 
+	/// Instruction flags.
+	cs_insn_flags flags;
+
 	/// If this instruction is an alias instruction, this member is set with
 	/// the alias ID.
 	/// Otherwise to <ARCH>_INS_INVALID.
@@ -476,15 +494,6 @@ typedef struct cs_insn {
 	/// This information is available even when CS_OPT_DETAIL = CS_OPT_OFF
 	char op_str[160];
 
-	/// True: This instruction is an alias.
-	/// False: Otherwise.
-	/// -- Only supported by auto-sync archs --
-	bool is_alias;
-
-	/// True: The operands are the ones of the alias instructions.
-	/// False: The detail operands are from the real instruction.
-	bool usesAliasDetails;
-
 	/// Pointer to cs_detail.
 	/// NOTE: detail pointer is only valid when both requirements below are met:
 	/// (1) CS_OP_DETAIL = CS_OPT_ON
@@ -495,6 +504,10 @@ typedef struct cs_insn {
 	cs_detail *detail;
 } cs_insn;
 
+/// Check if all flags is set.
+#define CS_INSN_FLAGS_ALL(INSN, FLAGS) (((INSN)->flags & (FLAGS)) == (FLAGS))
+/// Check if any flag is set.
+#define CS_INSN_FLAGS_ANY(INSN, FLAGS) (((INSN)->flags & (FLAGS)) != 0)
 
 /// Calculate the offset of a disassembled instruction in its buffer, given its position
 /// in its array of disassembled insn