diff --git a/clipmenud b/clipmenud
index 92d2c5f..a65e84e 100755
--- a/clipmenud
+++ b/clipmenud
@@ -84,7 +84,7 @@ while sleep "${CLIPMENUD_SLEEP:-0.5}"; do
 
         debug "Data after stripping: $data"
 
-        if [[ $data == *[^[:blank:]]* ]]; then
+        if [[ $data != *[^[:blank:]]* ]]; then
             debug "Skipping as clipboard is only blank"
             continue
         fi