diff --git a/config/c-compiler.m4 b/config/c-compiler.m4
index f87beb0d66..8bc6d32e23 100644
--- a/config/c-compiler.m4
+++ b/config/c-compiler.m4
@@ -71,8 +71,10 @@ 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 82b161417a..a893d68e02 100644
--- a/config/c-library.m4
+++ b/config/c-library.m4
@@ -204,8 +204,10 @@ 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_modifier=$pgac_modifier; break],
 [],
diff --git a/configure b/configure
index d4442f3828..394f658e35 100755
--- a/configure
+++ b/configure
@@ -13853,8 +13853,10 @@ int does_int64_work()
     return 0;
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_work());
+  return (! does_int64_work());
 }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
@@ -13935,8 +13937,10 @@ int does_int64_work()
     return 0;
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_work());
+  return (! does_int64_work());
 }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
@@ -14011,8 +14015,10 @@ int does_int64_snprintf_work()
     return 0;			/* either multiply or snprintf is busted */
   return 1;
 }
+
+int
 main() {
-  exit(! does_int64_snprintf_work());
+  return (! does_int64_snprintf_work());
 }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :