diff --git a/etc/caseDicts/postProcessing/pressure/pressureDifference.cfg b/etc/caseDicts/postProcessing/pressure/pressureDifference.cfg
index 9ac24c7073..4f652d2ab6 100644
--- a/etc/caseDicts/postProcessing/pressure/pressureDifference.cfg
+++ b/etc/caseDicts/postProcessing/pressure/pressureDifference.cfg
@@ -12,7 +12,7 @@ libs            ("libfieldFunctionObjects.so");
 operation       subtract;
 
 writeControl    timeStep;
-writeInterval   1
+writeInterval   1;
 log             false;
 
 region1