diff --git a/tekton/tasks/buildah/0.8.0/buildah.yaml b/tekton/tasks/buildah/0.8.0/buildah.yaml
index 03cb78cf3..7bc201c7a 100644
--- a/tekton/tasks/buildah/0.8.0/buildah.yaml
+++ b/tekton/tasks/buildah/0.8.0/buildah.yaml
@@ -106,6 +106,10 @@ spec:
         [ "$(workspaces.sslcertdir.bound)" = "true" ] && CERT_DIR_FLAG="--cert-dir=$(workspaces.sslcertdir.path)"
         [ "$(workspaces.dockerconfig.bound)" = "true" ] && DOCKER_CONFIG="$(workspaces.dockerconfig.path)" && export DOCKER_CONFIG
 
+        # Resolve the IMAGE param into a shell variable so string operations
+        # like ${IMAGE%:*} work correctly.
+        IMAGE="$(params.IMAGE)"
+
         # Detect if multi-arch mode is enabled (IMAGE_REPOSITORIES is non-empty)
         MULTI_ARCH=false
         if [ -n "$(params.IMAGE_REPOSITORIES)" ]; then