diff --git a/CHANGELOG.md b/CHANGELOG.md
index c79d36f..e34ef84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ and this project **does not adhere to [Semantic Versioning](http://semver.org/sp
 ### Changed
 
 * extract "include_files" function
+* capture cmp(1) error output
 
 ### Deprecated
 
diff --git a/minifirewall b/minifirewall
index 259770e..e9f938a 100755
--- a/minifirewall
+++ b/minifirewall
@@ -285,7 +285,7 @@ check_unpersisted_state() {
         rm -f "${STATE_FILE_DIFF}"
 
         if [ -f "${STATE_FILE_LATEST}" ]; then
-            cmp_result=$(cmp "${STATE_FILE_LATEST}" "${STATE_FILE_CURRENT}")
+            cmp_result=$(cmp "${STATE_FILE_LATEST}" "${STATE_FILE_CURRENT}" 2>&1)
             cmp_rc=$?
 
             if [ ${cmp_rc} -eq 0 ]; then
@@ -326,7 +326,7 @@ report_state_changes() {
         # But if there is a previous known state
         # let's compare with the new known state
         if [ -f "${STATE_FILE_PREVIOUS}" ]; then
-            cmp_result=$(cmp "${STATE_FILE_PREVIOUS}" "${STATE_FILE_LATEST}")
+            cmp_result=$(cmp "${STATE_FILE_PREVIOUS}" "${STATE_FILE_LATEST}" 2>&1)
             cmp_rc=$?
 
             if [ ${cmp_rc} -eq 0 ]; then