diff --git a/configure b/configure
index 1d0a19b710..c223953c55 100755
--- a/configure
+++ b/configure
@@ -21547,13 +21547,13 @@ else
                     int main()
                     {
                         FILE *f=fopen("conftestval", "w");
-                        if (!f) exit(1);
+                        if (!f) return 1;
                         fprintf(f, "%s",
                                 ZLIB_VERSION[0] == '1' &&
                                 (ZLIB_VERSION[2] > '1' ||
                                 (ZLIB_VERSION[2] == '1' &&
                                  ZLIB_VERSION[4] >= '4')) ? "yes" : "no");
-                        exit(0);
+                        return 0;
                     }
 
 _ACEOF
@@ -21686,10 +21686,10 @@ else
                     int main()
                     {
                         FILE *f=fopen("conftestval", "w");
-                        if (!f) exit(1);
+                        if (!f) return 1;
                         fprintf(f, "%s",
                                  PNG_LIBPNG_VER > 90 ? "yes" : "no");
-                        exit(0);
+                        return 0;
                     }
 
 _ACEOF
diff --git a/configure.in b/configure.in
index 60f8846056..72b3ad0e17 100644
--- a/configure.in
+++ b/configure.in
@@ -2451,13 +2451,13 @@ if test "$wxUSE_ZLIB" != "no" ; then
                     int main()
                     {
                         FILE *f=fopen("conftestval", "w");
-                        if (!f) exit(1);
+                        if (!f) return 1;
                         fprintf(f, "%s",
                                 ZLIB_VERSION[0] == '1' &&
                                 (ZLIB_VERSION[2] > '1' ||
                                 (ZLIB_VERSION[2] == '1' &&
                                  ZLIB_VERSION[4] >= '4')) ? "yes" : "no");
-                        exit(0);
+                        return 0;
                     }
                 ],
                 ac_cv_header_zlib_h=`cat conftestval`,
@@ -2536,10 +2536,10 @@ if test "$wxUSE_LIBPNG" != "no" ; then
                     int main()
                     {
                         FILE *f=fopen("conftestval", "w");
-                        if (!f) exit(1);
+                        if (!f) return 1;
                         fprintf(f, "%s",
                                  PNG_LIBPNG_VER > 90 ? "yes" : "no");
-                        exit(0);
+                        return 0;
                     }
                 ],
                 ac_cv_header_png_h=`cat conftestval`,