diff --git a/autoheader.in b/autoheader.in
index 04a94f44..ff33ac3f 100644
--- a/autoheader.in
+++ b/autoheader.in
@@ -200,7 +200,11 @@ done
 
 if test $# -eq 0; then
   if test $status -eq 0; then
-    mv -f $tmpout ${config_h}.in
+    if cmp -s $tmpout ${config_h}.in; then
+      mv -f $tmpout ${config_h}.in
+    else
+      rm -f $tmpout
+    fi
   else
     rm -f $tmpout
   fi
diff --git a/autoheader.sh b/autoheader.sh
index 04a94f44..ff33ac3f 100644
--- a/autoheader.sh
+++ b/autoheader.sh
@@ -200,7 +200,11 @@ done
 
 if test $# -eq 0; then
   if test $status -eq 0; then
-    mv -f $tmpout ${config_h}.in
+    if cmp -s $tmpout ${config_h}.in; then
+      mv -f $tmpout ${config_h}.in
+    else
+      rm -f $tmpout
+    fi
   else
     rm -f $tmpout
   fi
diff --git a/bin/autoheader.in b/bin/autoheader.in
index 04a94f44..ff33ac3f 100644
--- a/bin/autoheader.in
+++ b/bin/autoheader.in
@@ -200,7 +200,11 @@ done
 
 if test $# -eq 0; then
   if test $status -eq 0; then
-    mv -f $tmpout ${config_h}.in
+    if cmp -s $tmpout ${config_h}.in; then
+      mv -f $tmpout ${config_h}.in
+    else
+      rm -f $tmpout
+    fi
   else
     rm -f $tmpout
   fi