diff --git a/visor.c b/visor.c
index c57e1aa..14a57ae 100644
--- a/visor.c
+++ b/visor.c
@@ -10,7 +10,9 @@
 
 #define DEFAULT_THREADS 4
 #define MAX_THREADS 32
-#define STR(x) #x
+// Stringizing requires extra step for the constants to get replaced before stringizing
+#define _STR(x) #x
+#define STR(x) _STR(x)