diff --git a/common/jpeg/jmemnobs.c b/common/jpeg/jmemnobs.c
index eb8c337..34b1895 100644
--- a/common/jpeg/jmemnobs.c
+++ b/common/jpeg/jmemnobs.c
@@ -69,9 +69,9 @@
  * Here we always say, "we got all you want bud!"
  */
 
-GLOBAL(long)
-jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
-		    long max_bytes_needed, long already_allocated)
+GLOBAL(size_t)
+jpeg_mem_available (j_common_ptr cinfo, size_t min_bytes_needed,
+		    size_t max_bytes_needed, size_t already_allocated)
 {
   return max_bytes_needed;
 }