diff --git a/configure b/configure
index bb5b1b8a271ca465f0b242a794cf51afe4229807..b77a8a8cf95f75e9adc79b62a8b95d201dca21de 100755
--- a/configure
+++ b/configure
@@ -740,32 +740,6 @@ EOF
   fi
 fi
 
-echo >> configure.log
-
-# find a four-byte unsiged integer type for crc calculations
-cat > $test.c <<EOF
-#include <stdio.h>
-#define is32(n,t) for(n=1,k=0;n;n<<=1,k++);if(k==32){puts(t);return 0;}
-int main() {
-  int k;
-  unsigned i;
-  unsigned long l;
-  unsigned short s;
-  is32(i, "unsigned")
-  is32(l, "unsigned long")
-  is32(s, "unsigned short")
-  return 1;
-}
-EOF
-Z_U4=""
-if try $CC $CFLAGS $test.c -o $test && Z_U4=`./$test` && test -n "$Z_U4"; then
-  sed < zconf.h "/#define Z_U4/s/\/\* \.\/configure may/#define Z_U4 $Z_U4   \/* .\/configure put the/" > zconf.temp.h
-  mv zconf.temp.h zconf.h
-  echo "Looking for a four-byte integer type... Found." | tee -a configure.log
-else
-  echo "Looking for a four-byte integer type... Not found." | tee -a configure.log
-fi
-
 # show the results in the log
 echo >> configure.log
 echo ALL = $ALL >> configure.log
diff --git a/zconf.h b/zconf.h
index 95c9ef648bad76605759d39759978915f308b9af..c6ec884d10c226f923ab1830d5acd69bcf7d5997 100644
--- a/zconf.h
+++ b/zconf.h
@@ -390,20 +390,14 @@ typedef uLong FAR uLongf;
    typedef Byte       *voidp;
 #endif
 
-/* ./configure may #define Z_U4 here */
-
 #if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
 #  include <limits.h>
-#  if (UINT_MAX == 0xffffffffUL)
+#  if (UINT_MAX == 4294967295)
 #    define Z_U4 unsigned
-#  else
-#    if (ULONG_MAX == 0xffffffffUL)
-#      define Z_U4 unsigned long
-#    else
-#      if (USHRT_MAX == 0xffffffffUL)
-#        define Z_U4 unsigned short
-#      endif
-#    endif
+#  elif (ULONG_MAX == 4294967295)
+#    define Z_U4 unsigned long
+#  elif (USHRT_MAX == 4294967295)
+#    define Z_U4 unsigned short
 #  endif
 #endif
 
diff --git a/zconf.h.cmakein b/zconf.h.cmakein
index 028be15f98fa11d05e0a47159aa928cefaea6728..9254e9a25351fcdff96a57d06887ee778e370c7f 100644
--- a/zconf.h.cmakein
+++ b/zconf.h.cmakein
@@ -392,20 +392,14 @@ typedef uLong FAR uLongf;
    typedef Byte       *voidp;
 #endif
 
-/* ./configure may #define Z_U4 here */
-
 #if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
 #  include <limits.h>
-#  if (UINT_MAX == 0xffffffffUL)
+#  if (UINT_MAX == 4294967295)
 #    define Z_U4 unsigned
-#  else
-#    if (ULONG_MAX == 0xffffffffUL)
-#      define Z_U4 unsigned long
-#    else
-#      if (USHRT_MAX == 0xffffffffUL)
-#        define Z_U4 unsigned short
-#      endif
-#    endif
+#  elif (ULONG_MAX == 4294967295)
+#    define Z_U4 unsigned long
+#  elif (USHRT_MAX == 4294967295)
+#    define Z_U4 unsigned short
 #  endif
 #endif
 
diff --git a/zconf.h.in b/zconf.h.in
index 95c9ef648bad76605759d39759978915f308b9af..c6ec884d10c226f923ab1830d5acd69bcf7d5997 100644
--- a/zconf.h.in
+++ b/zconf.h.in
@@ -390,20 +390,14 @@ typedef uLong FAR uLongf;
    typedef Byte       *voidp;
 #endif
 
-/* ./configure may #define Z_U4 here */
-
 #if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
 #  include <limits.h>
-#  if (UINT_MAX == 0xffffffffUL)
+#  if (UINT_MAX == 4294967295)
 #    define Z_U4 unsigned
-#  else
-#    if (ULONG_MAX == 0xffffffffUL)
-#      define Z_U4 unsigned long
-#    else
-#      if (USHRT_MAX == 0xffffffffUL)
-#        define Z_U4 unsigned short
-#      endif
-#    endif
+#  elif (ULONG_MAX == 4294967295)
+#    define Z_U4 unsigned long
+#  elif (USHRT_MAX == 4294967295)
+#    define Z_U4 unsigned short
 #  endif
 #endif