diff --git a/env.d/development/common b/env.d/development/common
index a0cf0fe5..de857d5b 100644
--- a/env.d/development/common
+++ b/env.d/development/common
@@ -66,3 +66,6 @@ COLLABORATION_WS_URL=ws://localhost:4444/collaboration/ws/
 DJANGO_SERVER_TO_SERVER_API_TOKENS=server-api-token
 Y_PROVIDER_API_BASE_URL=http://y-provider-development:4444/api/
 Y_PROVIDER_API_KEY=yprovider-api-key
+
+# Theme customization
+THEME_CUSTOMIZATION_CACHE_TIMEOUT=15
\ No newline at end of file
diff --git a/src/backend/impress/settings.py b/src/backend/impress/settings.py
index 151f2bfd..2229036c 100755
--- a/src/backend/impress/settings.py
+++ b/src/backend/impress/settings.py
@@ -490,7 +490,7 @@ class Base(Configuration):
         environ_prefix=None,
     )
 
-    THEME_CUSTOMIZATION_CACHE_TIMEOUT = values.Value(
+    THEME_CUSTOMIZATION_CACHE_TIMEOUT = values.IntegerValue(
         60 * 60 * 24,
         environ_name="THEME_CUSTOMIZATION_CACHE_TIMEOUT",
         environ_prefix=None,