diff --git a/ANNOUNCE b/ANNOUNCE
index df504ed7b..1b7afa2d9 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -383,6 +383,7 @@ Version 1.5.0beta45 [August 24, 2010]
     what it calls an "authoring error".  The change to make pnglibconf.h
     simply copies the file; in the future it may actually generate the
     file from scripts/pnglibconf.dfa as the other build systems do.
+  Changed pngvalid to work when floating point APIs are disabled
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
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diff --git a/CHANGES b/CHANGES
index 965e1d5a3..a5667dc0f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3020,6 +3020,7 @@ Version 1.5.0beta45 [August 24, 2010]
     what it calls an "authoring error".  The change to make pnglibconf.h
     simply copies the file; in the future it may actually generate the
     file from scripts/pnglibconf.dfa as the other build systems do.
+  Changed pngvalid to work when floating point APIs are disabled
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/pngvalid.c b/pngvalid.c
index 92a158bc2..85993a18b 100644
--- a/pngvalid.c
+++ b/pngvalid.c
@@ -3078,7 +3078,15 @@ gamma_test(png_modifier *pmIn, PNG_CONST png_byte colour_typeIn,
       pp = set_modifier_for_read(d.pm, &pi, d.this.id, name);
 
       /* Set up gamma processing. */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
       png_set_gamma(pp, d.screen_gamma, d.file_gamma);
+#else
+      {
+         png_fixed_point s = floor(d.screen_gamma*100000+.5);
+         png_fixed_point f = floor(d.file_gamma*100000+.5);
+         png_set_gamma_fixed(pp, s, f);
+      }
+#endif
 
       /* Introduce the correct read function. */
       if (d.pm->this.progressive)