diff --git a/src/zm_config.h.z b/src/zm_config.h.z
index ffbbc6f0d..216bfe974 100644
--- a/src/zm_config.h.z
+++ b/src/zm_config.h.z
@@ -41,4 +41,4 @@
 
 #define ZM_STRICT_VIDEO_CONFIG	<from zmconfig> // Whether to allow errors in setting video config to be fatal
 #define ZM_LOCAL_BGR_INVERT		<from zmconfig> // Invert BGR colours to RGB
-#define ZM_BLEND_ALARM_IMAGES	<from zmconfig> // Whether alarmed images are blended to update the reference image
+#define ZM_BLEND_ALARMED_IMAGES	<from zmconfig> // Whether alarmed images are blended to update the reference image