diff --git a/roles/slurm-common/templates/slurm.prolog.j2 b/roles/slurm-common/templates/slurm.prolog.j2
index af563f852887fed89c763d3596fedc5a54affa4c..187206c6e5851e2113c4dd81d4ec0f0581eb5b58 100644
--- a/roles/slurm-common/templates/slurm.prolog.j2
+++ b/roles/slurm-common/templates/slurm.prolog.j2
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # echo 1 to drop page cache
-sync; echo 1 > /proc/sys/vm/drop_caches
+/bin/sync
+/bin/echo 1 > /proc/sys/vm/drop_caches
 
 exit 0