diff --git a/crates/compiler/builtins/bitcode/src/dec.zig b/crates/compiler/builtins/bitcode/src/dec.zig
index 75340094e7c..d60057843c9 100644
--- a/crates/compiler/builtins/bitcode/src/dec.zig
+++ b/crates/compiler/builtins/bitcode/src/dec.zig
@@ -463,6 +463,10 @@ pub const RocDec = extern struct {
         return RocDec{ .num = out };
     }
 
+    pub fn log(self: RocDec) RocDec {
+        return fromF64(@log(self.toF64())).?;
+    }
+
     // I belive the output of the trig functions is always in range of Dec.
     // If not, we probably should just make it saturate the Dec.
     // I don't think this should crash or return errors.
@@ -1190,6 +1194,10 @@ test "div: 500 / 1000" {
     try expectEqual(RocDec.fromStr(roc_str), number1.div(number2));
 }
 
+test "log: 1" {
+    try expectEqual(RocDec.fromU64(0), RocDec.log(RocDec.fromU64(1)));
+}
+
 // exports
 
 pub fn fromStr(arg: RocStr) callconv(.C) num_.NumParseResult(i128) {
@@ -1282,6 +1290,10 @@ pub fn divC(arg1: RocDec, arg2: RocDec) callconv(.C) i128 {
     return @call(.always_inline, RocDec.div, .{ arg1, arg2 }).num;
 }
 
+pub fn logC(arg: RocDec) callconv(.C) i128 {
+    return @call(.always_inline, RocDec.log, .{arg}).num;
+}
+
 pub fn sinC(arg: RocDec) callconv(.C) i128 {
     return @call(.always_inline, RocDec.sin, .{arg}).num;
 }
diff --git a/crates/compiler/builtins/bitcode/src/main.zig b/crates/compiler/builtins/bitcode/src/main.zig
index 8979819f9bb..6b0a5cc9d60 100644
--- a/crates/compiler/builtins/bitcode/src/main.zig
+++ b/crates/compiler/builtins/bitcode/src/main.zig
@@ -32,6 +32,7 @@ comptime {
     exportDecFn(dec.fromF64C, "from_float.f64");
     exportDecFn(dec.fromStr, "from_str");
     exportDecFn(dec.fromU64C, "from_u64");
+    exportDecFn(dec.logC, "log");
     exportDecFn(dec.mulC, "mul_with_overflow");
     exportDecFn(dec.mulOrPanicC, "mul_or_panic");
     exportDecFn(dec.mulSaturatedC, "mul_saturated");
diff --git a/crates/compiler/builtins/src/bitcode.rs b/crates/compiler/builtins/src/bitcode.rs
index 8482f79739e..f9f28b12bb8 100644
--- a/crates/compiler/builtins/src/bitcode.rs
+++ b/crates/compiler/builtins/src/bitcode.rs
@@ -408,6 +408,7 @@ pub const DEC_FROM_FLOAT: IntrinsicName = float_intrinsic!("roc_builtins.dec.fro
 pub const DEC_FROM_INT: IntrinsicName = int_intrinsic!("roc_builtins.dec.from_int");
 pub const DEC_FROM_STR: &str = "roc_builtins.dec.from_str";
 pub const DEC_FROM_U64: &str = "roc_builtins.dec.from_u64";
+pub const DEC_LOG: &str = "roc_builtins.dec.log";
 pub const DEC_MUL_OR_PANIC: &str = "roc_builtins.dec.mul_or_panic";
 pub const DEC_MUL_SATURATED: &str = "roc_builtins.dec.mul_saturated";
 pub const DEC_MUL_WITH_OVERFLOW: &str = "roc_builtins.dec.mul_with_overflow";