diff --git a/pngtest.c b/pngtest.c
index 051eca9e1..4673c6c43 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -983,7 +983,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
    }
 #endif
-#if def PNG_sCAL_SUPPORTED
+#ifdef PNG_sCAL_SUPPORTED
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    {
       int unit;