diff --git a/mfbt/tests/TestPoisonArea.cpp b/mfbt/tests/TestPoisonArea.cpp
index fbd33647150a..4816bd968197 100644
--- a/mfbt/tests/TestPoisonArea.cpp
+++ b/mfbt/tests/TestPoisonArea.cpp
@@ -132,6 +132,9 @@
 #elif defined _ARCH_PPC || defined _ARCH_PWR || defined _ARCH_PWR2
 #  define RETURN_INSTR 0x4E800020 /* blr */
 
+#elif defined __m68k__
+#  define RETURN_INSTR 0x4E754E75 /* rts; rts */
+
 #elif defined __sparc || defined __sparcv9
 #  define RETURN_INSTR 0x81c3e008 /* retl */