diff --git a/Makefile b/Makefile
index a394d6d..94b20a8 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ SDL_BASE := C:\apps\SDL-1.2.13
 ODE_BASE := C:\apps\ode-0.9
 export CPPFLAGS += -I$(SDL_BASE)\include -D_GNU_SOURCE=1 -Dmain=SDL_main
 ifndef WITHOUT_ODE
-export CPPFLAGS += -i$(ODE_BASE)\include
+export CPPFLAGS += -I$(ODE_BASE)\include
 endif
 LDFLAGS += -L$(SDL_BASE)\lib -lopengl32 -lglu32 -lmingw32 -mwindows -lSDLmain -lSDL
 ifndef WITHOUT_ODE