diff --git a/winbuild/build_dep.py b/winbuild/build_dep.py
index 5720efb1a..7fea57772 100644
--- a/winbuild/build_dep.py
+++ b/winbuild/build_dep.py
@@ -143,7 +143,7 @@ setlocal
 @echo on
 cd /D %%OPENJPEG%%%(inc_dir)s
 
-%%CMAKE%% -DBUILD_THIRDPARTY:BOOL=OFF -DBUILD_SHARED_LIBS:BOOL=OFF -G "NMake Makefiles" .
+%%CMAKE%% -DBUILD_THIRDPARTY:BOOL=OFF -DBUILD_SHARED_LIBS:BOOL=OFF -DCMAKE_BUILD_TYPE=Release -G "NMake Makefiles" .
 nmake -nologo -f Makefile clean
 nmake -nologo -f Makefile
 copy /Y /B bin\* %%INCLIB%%