diff --git a/config/c-compiler.m4 b/config/c-compiler.m4
index 8a216c9f73c..349e0932a9f 100644
--- a/config/c-compiler.m4
+++ b/config/c-compiler.m4
@@ -84,8 +84,10 @@ int does_int64_work()
     return 0;
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_work());
+  return (! does_int64_work());
 }],
 [Ac_cachevar=yes],
 [Ac_cachevar=no],
diff --git a/config/c-library.m4 b/config/c-library.m4
index 70eb0e4dcf7..d1849214645 100644
--- a/config/c-library.m4
+++ b/config/c-library.m4
@@ -250,8 +250,10 @@ int does_int64_snprintf_work()
     return 0;			/* either multiply or snprintf is busted */
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_snprintf_work());
+  return (! does_int64_snprintf_work());
 }],
 [pgac_cv_snprintf_long_long_int_format=$pgac_format; break],
 [],
diff --git a/configure b/configure
index 6c2a1755ce7..23486236442 100755
--- a/configure
+++ b/configure
@@ -24588,8 +24588,10 @@ int does_int64_work()
     return 0;
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_work());
+  return (! does_int64_work());
 }
 _ACEOF
 rm -f conftest$ac_exeext
@@ -24725,8 +24727,10 @@ int does_int64_work()
     return 0;
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_work());
+  return (! does_int64_work());
 }
 _ACEOF
 rm -f conftest$ac_exeext
@@ -24829,8 +24833,10 @@ int does_int64_snprintf_work()
     return 0;			/* either multiply or snprintf is busted */
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_snprintf_work());
+  return (! does_int64_snprintf_work());
 }
 _ACEOF
 rm -f conftest$ac_exeext