diff --git a/Include/StrFunc.nsh b/Include/StrFunc.nsh
index 2dc46e77..7a106ed4 100644
--- a/Include/StrFunc.nsh
+++ b/Include/StrFunc.nsh
@@ -20,11 +20,11 @@ o-----------------------------------------------------------------------------o
 
 !include LogicLib.nsh
 
-!define FALSE 0
-!define TRUE 1
-
 !ifndef STRFUNC
 
+  !define FALSE 0
+  !define TRUE 1
+
   ;Header File Identification
 
   !define STRFUNC `String Functions Header File`