diff --git a/aclocal.m4 b/aclocal.m4
index 3026cee81..938dd6758 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -123,7 +123,7 @@ int main()
 }
 EOF
 ${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.constructor.$ac_ext $LIBS 1>&5
-if test -n "`nm conftest | grep _ctors_aux`"; then 
+if test -n "`nm conftest${ac_exeext} | grep _ctors_aux`"; then 
   objc_cv_con_autoload=yes
 else
   objc_cv_con_autoload=no
diff --git a/configure b/configure
index 6ff47ca2e..4f5ca9467 100755
--- a/configure
+++ b/configure
@@ -2041,7 +2041,7 @@ int main()
 }
 EOF
 ${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.constructor.$ac_ext $LIBS 1>&5
-if test -n "`nm conftest | grep _ctors_aux`"; then 
+if test -n "`nm conftest${ac_exeext} | grep _ctors_aux`"; then 
   objc_cv_con_autoload=yes
 else
   objc_cv_con_autoload=no