diff --git a/src/add-ons/opengl/swrast_legacy/Jamfile b/src/add-ons/opengl/swrast_legacy/Jamfile
index 6f171b6c81..d9ac110474 100644
--- a/src/add-ons/opengl/swrast_legacy/Jamfile
+++ b/src/add-ons/opengl/swrast_legacy/Jamfile
@@ -20,6 +20,8 @@ if $(TARGET_PLATFORM) != haiku {
 	} else if $(TARGET_ARCH) = sparc {
 		defines += USE_SPARC_ASM ;
 	}
+
+	SubDirC++Flags [ FDefines $(defines) ] ;
 }