@@ -131,11 +131,11 @@
 		[Whether we are compiling for the Nintendo 3DS])
 	AC_SUBST(MAP_LDFLAGS, ['-Wl,-Map,$@.map'])
 ])
 
 CPP="$OBJCPP"
-CPPFLAGS="$CPPFLAGS $OBJCPPFLAGS"
+CPPFLAGS="$CPPFLAGS $OBJCPPFLAGS -DOF_COMPILING_OBJFW"
 OBJCFLAGS="$OBJCFLAGS -Wall -fexceptions -fobjc-exceptions -funwind-tables"
 OBJCFLAGS="$OBJCFLAGS -fconstant-string-class=OFConstantString"
 
 case "$OBJC" in
 	*clang*)