diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d589c0ea70..48101c431b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -914,7 +914,7 @@ Windows_Ninja_RelWithDebInfo_GroupTwo:
     - .Windows_Ninja_RelWithDebInfo
   variables:
     <<: *target-group-two
-    CCACHE_SIZE: 2G
+    CCACHE_SIZE: 1.5G
   # GitLab won't let us use non-predefined variables in cache keys, so we've got to repeat this block
   cache:
     - key: ninja-2022-v13
@@ -1129,7 +1129,7 @@ Windows_MSBuild_RelWithDebInfo_GroupTwo:
     - .Windows_MSBuild_RelWithDebInfo
   variables:
     <<: *target-group-two
-    CCACHE_SIZE: 2.5G
+    CCACHE_SIZE: 1.5G
   # GitLab won't let us use non-predefined variables in cache keys, so we've got to repeat this block
   cache:
     - key: msbuild-2022-v13