diff --git a/pngrutil.c b/pngrutil.c
index cc06fb39c..e0a812d47 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -29,8 +29,8 @@ png_get_uint_31(png_structp png_ptr, png_bytep buf)
 }
 #ifndef PNG_USE_READ_MACROS
 /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
-png_uint_32 PNGAPI
-png_get_uint_32(png_bytep buf)
+png_uint_32 (PNGAPI
+png_get_uint_32)(png_bytep buf)
 {
    png_uint_32 i =
        ((png_uint_32)(*(buf    )) << 24) +
@@ -45,8 +45,8 @@ png_get_uint_32(png_bytep buf)
  * data is stored in the PNG file in two's complement format, and it is
  * assumed that the machine format for signed integers is the same.
  */
-png_int_32 PNGAPI
-png_get_int_32(png_bytep buf)
+png_int_32 (PNGAPI
+png_get_int_32)(png_bytep buf)
 {
    png_int_32 i = ((png_int_32)(*buf) << 24) +
        ((png_int_32)(*(buf + 1)) << 16) +
@@ -57,8 +57,8 @@ png_get_int_32(png_bytep buf)
 }
 
 /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
-png_uint_16 PNGAPI
-png_get_uint_16(png_bytep buf)
+png_uint_16 (PNGAPI
+png_get_uint_16)(png_bytep buf)
 {
    png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
        (png_uint_16)(*(buf + 1)));