diff --git a/cmake/generic/modules/FindNumpy.cmake b/cmake/generic/modules/FindNumpy.cmake
index 26debbea82f6f115c0ff9473aeea09cfa29bd079..f17b75c44158a6fa393598e3cc376e1288792ff8 100644
--- a/cmake/generic/modules/FindNumpy.cmake
+++ b/cmake/generic/modules/FindNumpy.cmake
@@ -44,6 +44,9 @@ else()
     endif()
 endif()
 
+if(WIN32)
+  STRING(REGEX REPLACE "\\\\" "/" NUMPY_INCLUDE_DIR ${NUMPY_INCLUDE_DIR})
+endif()
 
 MARK_AS_ADVANCED (NUMPY_INCLUDE_DIR)
 MARK_AS_ADVANCED (NUMPY_VERSION_STRING)