diff --git a/mkfls/unix/configure b/mkfls/unix/configure
index 9c17e036..8cb04ec5 100755
--- a/mkfls/unix/configure
+++ b/mkfls/unix/configure
@@ -5275,8 +5275,8 @@ int
 main ()
 {
 
-  BZ2_bzBuffToBuffCompress(0, (unsigned long*) 0, "", 0, 6, 0, 0);
-  BZ2_bzBuffToBuffDecompress(0, (unsigned long*) 0, "", 0, 0, 0);
+  BZ2_bzBuffToBuffCompress(0, (unsigned int*) 0, "", 0, 6, 0, 0);
+  BZ2_bzBuffToBuffDecompress(0, (unsigned int*) 0, "", 0, 0, 0);
 
   ;
   return 0;
diff --git a/mkfls/unix/configure.in b/mkfls/unix/configure.in
index c9e54861..5798ff9d 100644
--- a/mkfls/unix/configure.in
+++ b/mkfls/unix/configure.in
@@ -504,8 +504,8 @@ if test ".$do_bzip2" != ".no" ; then
 #endif
 ],
 [
-  BZ2_bzBuffToBuffCompress(0, (unsigned long*) 0, "", 0, 6, 0, 0);
-  BZ2_bzBuffToBuffDecompress(0, (unsigned long*) 0, "", 0, 0, 0);
+  BZ2_bzBuffToBuffCompress(0, (unsigned int*) 0, "", 0, 6, 0, 0);
+  BZ2_bzBuffToBuffDecompress(0, (unsigned int*) 0, "", 0, 0, 0);
 ],
 	    found_bzlib2="$bzlib2_path", found_bzlib2=no
 	  )