diff --git a/docker-gc b/docker-gc
index 28a0183..3227c3e 100755
--- a/docker-gc
+++ b/docker-gc
@@ -129,7 +129,7 @@ function compute_exclude_ids() {
         | sed 's/^\([^ ]*\) *\([^ ]*\) *\([^ ]*\).*/ \1:\2 \3 /' \
         | grep -f $PROCESSED_EXCLUDES 2>/dev/null \
         | cut -d' ' -f3 \
-        | sed 's/^/^(sha256:)?/' > $EXCLUDE_IDS_FILE
+        | sed 's/^/sha256:/' > $EXCLUDE_IDS_FILE
 }
 
 function compute_exclude_container_ids() {