diff --git a/VortexEngine/VortexLib/Makefile b/VortexEngine/VortexLib/Makefile
index 6b3575a2b6..c136b665bd 100644
--- a/VortexEngine/VortexLib/Makefile
+++ b/VortexEngine/VortexLib/Makefile
@@ -30,7 +30,7 @@ DEFINES=\
 	-D VORTEX_VERSION_MAJOR=$(VORTEX_VERSION_MAJOR) \
 	-D VORTEX_VERSION_MINOR=$(VORTEX_VERSION_MINOR) \
 	-D VORTEX_BUILD_NUMBER=$(VORTEX_BUILD_NUMBER) \
-	-D VORTEX_VERSION_NUIMBER=$(VORTEX_VERSION_NUIMBER)
+	-D VORTEX_VERSION_NUMBER=$(VORTEX_VERSION_NUMBER)
 
 # compiler include paths
 INCLUDES=\