diff --git a/_data/rules.yml b/_data/rules.yml
index 25f6270..d88fae5 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -50,7 +50,7 @@ services:
             severity: warning
           - name: Disk will fill in 4 hours
             description: Disk will fill in 4 hours at current write rate
-            query: "predict_linear(node_filesystem_free_bytes{fstype!~"tmpfs"}[1h], 4 * 3600) < 0"
+            query: 'predict_linear(node_filesystem_free_bytes{fstype!~"tmpfs"}[1h], 4 * 3600) < 0'
             severity: warning
           - name: Out of inodes
             description: Disk is almost running out of available inodes (< 10% left)