diff --git a/lib/wrappers/pcre.nim b/lib/wrappers/pcre.nim
index e582b2c663..2831479324 100755
--- a/lib/wrappers/pcre.nim
+++ b/lib/wrappers/pcre.nim
@@ -35,7 +35,7 @@
 #-----------------------------------------------------------------------------
 #
 
-when defined(pcreDll):
+when not defined(pcreDll):
   when hostOS == "windows":
     const pcreDll = "pcre.dll"
   elif hostOS == "macosx":