diff --git a/libs/spandsp/src/spandsp/t30.h b/libs/spandsp/src/spandsp/t30.h
index ee842afea8..1e66a95a27 100644
--- a/libs/spandsp/src/spandsp/t30.h
+++ b/libs/spandsp/src/spandsp/t30.h
@@ -373,12 +373,12 @@ enum
     /*! T.81 + T.30 Annex K colour sYCC-JPEG compression */
     T30_SUPPORT_SYCC_T81_COMPRESSION = 0x200,
     /*! T.88 monochrome JBIG2 compression */
-    T30_SUPPORT_T88_COMPRESSION = 0x400,
-    /*! Dither a gray scale image down a simple bilevel image, with rescaling to fit a FAX page */
-    T30_SUPPORT_GRAY_TO_BILEVEL = 0x10000000,
-    /*! Dither a colour image down a simple bilevel image, with rescaling to fit a FAX page */
-    T30_SUPPORT_COLOUR_TO_BILEVEL = 0x20000000
+    T30_SUPPORT_T88_COMPRESSION = 0x400
 };
+    /*! Dither a gray scale image down a simple bilevel image, with rescaling to fit a FAX page */
+#define T30_SUPPORT_GRAY_TO_BILEVEL 0x10000000
+    /*! Dither a colour image down a simple bilevel image, with rescaling to fit a FAX page */
+#define T30_SUPPORT_COLOUR_TO_BILEVEL 0x20000000
 
 enum
 {