diff --git a/leveldbstatic/prelude.nim b/leveldbstatic/prelude.nim
index cc7d12d..32bbbae 100644
--- a/leveldbstatic/prelude.nim
+++ b/leveldbstatic/prelude.nim
@@ -9,7 +9,7 @@ const
     when defined(macosx):
       "-DCMAKE_BUILD_TYPE=Release"
     elif defined(windows):
-      "-G\"MSYS Makefiles\" -DCMAKE_BUILD_TYPE=Release -DHAVE_STD_REGEX=ON -DRUN_HAVE_STD_REGEX=1"
+      "-G\"MSYS Makefiles\" -DCMAKE_BUILD_TYPE=Release"
     else:
       "-DCMAKE_BUILD_TYPE=Release"
   
diff --git a/leveldbstatic/raw.nim b/leveldbstatic/raw.nim
index 40b1aea..501ab29 100644
--- a/leveldbstatic/raw.nim
+++ b/leveldbstatic/raw.nim
@@ -9,7 +9,7 @@ const
     when defined(macosx):
       "-DCMAKE_BUILD_TYPE=Release"
     elif defined(windows):
-      "-G\"MSYS Makefiles\" -DCMAKE_BUILD_TYPE=Release -DHAVE_STD_REGEX=ON -DRUN_HAVE_STD_REGEX=1"
+      "-G\"MSYS Makefiles\" -DCMAKE_BUILD_TYPE=Release"
     else:
       "-DCMAKE_BUILD_TYPE=Release"