diff --git a/src/execute.c b/src/execute.c
index 1f37999..428e661 100644
--- a/src/execute.c
+++ b/src/execute.c
@@ -86,7 +86,7 @@ inline static dword getMSBPos(a64inst_regType regType) {
 
 // Returns the MSB of the given value assuming it's of the size stored in the given register type
 inline static uint8_t getMSB(dword value, a64inst_regType regType) {
-    return value >> getMSBPos(regType); 
+    return (value >> getMSBPos(regType)) & 1u; 
 }
 
 // Updates N and Z condition codes given the machine and a result value