diff --git a/src/lmdb/CMakeLists.txt b/src/lmdb/CMakeLists.txt
index 7f62bb62044..598d601a35c 100644
--- a/src/lmdb/CMakeLists.txt
+++ b/src/lmdb/CMakeLists.txt
@@ -23,10 +23,6 @@ add_library(bareoslmdb SHARED mdb.c midl.c)
 # empty the include_directories
 set_property(TARGET bareoslmdb PROPERTY INCLUDE_DIRECTORIES "")
 
-IF(HAVE_WIN32)
-   add_definitions(-Wall -m64 -mwin32 -mthreads)
-ENDIF()
-
 set_target_properties(bareoslmdb PROPERTIES VERSION "${VERSION}"
                                           SOVERSION "${SOVERSION}"
                                           DEFINE_SYMBOL "BUILDING_DLL"