diff --git a/pre_cache_action.sh b/pre_cache_action.sh
index 326c3e9..2b48b54 100755
--- a/pre_cache_action.sh
+++ b/pre_cache_action.sh
@@ -56,9 +56,10 @@ log_empty_line
 versioned_packages=""
 log "Verifying packages..."
 for package in ${packages}; do
-  if test ! "$(apt-cache show ${package})"; then
+  package_name=$(echo ${package} | awk -F\= '{print $1}')
+  if test ! "$(apt-cache show ${package_name})"; then
     echo "aborted"
-    log "Package '${package}' not found." >&2
+    log "Package '${package_name}' not found." >&2
     exit 5
   fi
   read package_name package_ver < <(get_package_name_ver "${package}")