diff --git a/tests/dmd/runnable/test17559.d b/tests/dmd/runnable/test17559.d
index 822ef94024..5a3bf28f7a 100644
--- a/tests/dmd/runnable/test17559.d
+++ b/tests/dmd/runnable/test17559.d
@@ -1,7 +1,8 @@
 // REQUIRED_ARGS: -g
 // REQUIRED_ARGS(linux freebsd dragonflybsd): -L-export-dynamic
 // LDC (required for Win32 and -O): REQUIRED_ARGS(windows32mscoff): -link-defaultlib-debug
-// LDC (FreeBSD's libexecinfo apparently doesn't like elided frame pointers): REQUIRED_ARGS(freebsd): -link-defaultlib-debug -frame-pointer=all
+// LDC (FreeBSD's libexecinfo apparently doesn't like elided frame pointers): REQUIRED_ARGS(freebsd): -frame-pointer=all
+// LDC (our _UnwindBacktrace implementation - for musl libc - requires this): REQUIRED_ARGS(linux): -link-defaultlib-debug
 // PERMUTE_ARGS:
 // DISABLED: osx
 
diff --git a/tests/dmd/runnable/test19086.d b/tests/dmd/runnable/test19086.d
index fce9a43a91..bbc6bf3bd7 100644
--- a/tests/dmd/runnable/test19086.d
+++ b/tests/dmd/runnable/test19086.d
@@ -1,6 +1,7 @@
 // REQUIRED_ARGS: -g
 // REQUIRED_ARGS(linux freebsd dragonflybsd): -L-export-dynamic
 // LDC (FreeBSD's libexecinfo apparently doesn't like elided frame pointers): REQUIRED_ARGS(freebsd): -link-defaultlib-debug -frame-pointer=all
+// LDC (our _UnwindBacktrace implementation - for musl libc - requires this): REQUIRED_ARGS(linux): -link-defaultlib-debug
 // DISABLED: LDC_win32 // no file/line info for the `run19086` frame (and only that frame), even without -O
 // PERMUTE_ARGS:
 // DISABLED: osx