diff --git a/include/Zydis/Defines.h b/include/Zydis/Defines.h
index 1f34fa0..760afba 100644
--- a/include/Zydis/Defines.h
+++ b/include/Zydis/Defines.h
@@ -129,12 +129,14 @@
 #endif
 
 #if defined(ZYDIS_RELEASE)
-#   if defined(ZYDIS_GNUC)
+#   if defined(ZYDIS_CLANG) // GCC eagerly evals && RHS, we have to use nested ifs.
 #       if __has_builtin(__builtin_unreachable)
 #           define ZYDIS_UNREACHABLE __builtin_unreachable()
 #       else
 #           define ZYDIS_UNREACHABLE
 #       endif
+#   elif defined(ZYDIS_GCC) && ((__GNUC__ == 4 && __GNUC_MINOR__ > 4) || __GNUC__ > 4)
+#       define ZYDIS_UNREACHABLE __builtin_unreachable()
 #   elif defined(ZYDIS_MSVC)
 #       define ZYDIS_UNREACHABLE __assume(0)
 #   else