diff --git a/lms/envs/common.py b/lms/envs/common.py
index 68d52779d9..97f0905d33 100644
--- a/lms/envs/common.py
+++ b/lms/envs/common.py
@@ -3332,7 +3332,7 @@ PROFILE_IMAGE_DEFAULT_FILE_EXTENSION = 'png'
 # profile images.  Once it has been set, changing it will make the
 # platform unaware of current image URLs, resulting in reverting all
 # users' profile images to the default placeholder image.
-PROFILE_IMAGE_SECRET_KEY = 'placeholder secret key'
+PROFILE_IMAGE_SECRET_KEY = 'placeholder_secret_key'
 PROFILE_IMAGE_MAX_BYTES = 1024 * 1024
 PROFILE_IMAGE_MIN_BYTES = 100
 PROFILE_IMAGE_SIZES_MAP = {