diff --git a/hooks/post-command b/hooks/post-command
index 1bd81b2..ed45983 100644
--- a/hooks/post-command
+++ b/hooks/post-command
@@ -58,7 +58,7 @@ cosign_keyless() {
 
     rm out.sig || true
 
-    COSIGN EXPERIMENTAL=1 cosign sign \
+    COSIGN_EXPERIMENTAL=1 cosign sign \
         -y \
         --fulcio-url="${fulcio_url}" \
         --rekor-url="${rekor_url}" \
@@ -66,7 +66,7 @@ cosign_keyless() {
         --oidc-provider="${oidc_provider}" \
         --output-signature=out.sig \
         "${image}"
-    
+
     status=$?
     if [[ $status -ne 0 ]]; then
         fail_with_message "cosign" "Failed to sign image"