diff --git a/internal/config.h.in b/internal/config.h.in
index b9008e19654dabf114fb9b7e60d75100918dd75d..7014ca320e5c5fea1f59a6fe5d9d1ea0987bf95e 100644
--- a/internal/config.h.in
+++ b/internal/config.h.in
@@ -24,8 +24,8 @@
 //            which will be added to the include path for compilation,
 //            and installed with the public wolf headers.
 
-#ifndef WOLF_INTERNAL_${UPPERNAME}_CONFIG_H_
-#define WOLF_INTERNAL_${UPPERNAME}_CONFIG_H_
+#ifndef WOLF_INTERNAL_${UPPER_NAME}_CONFIG_H_
+#define WOLF_INTERNAL_${UPPER_NAME}_CONFIG_H_
 
 #cmakedefine _WOLF_DEBUG