diff --git a/go-build/action.yml b/go-build/action.yml
index b4d8fb0..6b98e12 100644
--- a/go-build/action.yml
+++ b/go-build/action.yml
@@ -97,7 +97,7 @@ runs:
         if [ -z "$detected_version" ] && [ -f Dockerfile ]; then
           echo "Checking Dockerfile for golang..." >&2
           version=$(grep -iF "FROM" Dockerfile | grep -F "golang:" | head -1 | \
-            sed -n -E "s/.*golang:([0-9]+(\.[0-9]+)*)(-[^:]*)?.*/ \1/p" || echo "")
+            sed -n -E "s/.*golang:([0-9]+(\.[0-9]+)*)(-[^:]*)?.*/\1/p" || echo "")
           if [ -n "$version" ]; then
             version=$(clean_version "$version")
             if validate_version "$version"; then