diff --git a/include/prism/defines.h b/include/prism/defines.h
index 3da9301be5..fd34ca09d4 100644
--- a/include/prism/defines.h
+++ b/include/prism/defines.h
@@ -250,6 +250,8 @@
     #define PRISM_FALLTHROUGH __attribute__((fallthrough));
 #elif defined(_MSC_VER)
     #define PRISM_FALLTHROUGH __fallthrough;
+#else
+    #define PRISM_FALLTHROUGH
 #endif
 
 #endif