diff --git a/direnv-cache b/direnv-cache
index f0a4972..6350657 100755
--- a/direnv-cache
+++ b/direnv-cache
@@ -32,22 +32,26 @@ diffEnvs() {
 
     while IFS= read -r -d '' line; do
         name=$(tr -d '\0' <<<"$line" | head -n1 | cut -f1 -d'=')
-        if ! getByName "$name" "$new" >/dev/null; then
-            echo "export -n '${name}'"
+        if ! [[ "$name" = DIRENV_* ]]; then
+            if ! getByName "$name" "$new" >/dev/null; then
+                echo "export -n '${name}'"
+            fi
         fi
     done <"$old"
 
     while IFS= read -rd $'\0' line; do
         name=$(tr -d '\0' <<<"$line" | head -n1 | cut -f1 -d'=')
-        if getByName "$name" "$old" >/dev/null; then
-            # found in old env, check if values match
-            if ! grep -z "^${line}\$" "$old" >/dev/null; then
-                # variable has changed
+        if ! [[ "$name" = DIRENV_* ]]; then
+            if getByName "$name" "$old" >/dev/null; then
+                # found in old env, check if values match
+                if ! grep -z "^${line}\$" "$old" >/dev/null; then
+                    # variable has changed
+                    echo "export ${line@Q}"
+                fi
+            else
+                # variable is new
                 echo "export ${line@Q}"
             fi
-        else
-            # variable is new
-            echo "export ${line@Q}"
         fi
     done <"$new"
 }