diff --git a/src/SecExp/securityReport.tw b/src/SecExp/securityReport.tw
index 5f063147c26114cdf79891537b059a4f49cc6644..1427bf6e89b427f1228411d25f4adf8d775e492c 100644
--- a/src/SecExp/securityReport.tw
+++ b/src/SecExp/securityReport.tw
@@ -122,7 +122,7 @@
 	It will still take <<if $garrison.assistantTime> 1>>$garrison.assistantTime weeks<<else>>a week<</if>> to finish repair works.
 	<<set _secGrowth-->>
 	<<set _crimeGrowth++>>
-	<<set $garrison.assistantTime--,$PC.engineering+= .1>>
+	<<set $garrison.assistantTime--,$PC.engineering += .1>>
 <</if>>
 
 <<if $SFSupportLevel >= 3>>