diff --git a/Makefile.in b/Makefile.in
index c07f2d317d..a996c31157 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1667,12 +1667,14 @@ WEBVIEWLIB_CXXFLAGS = $(__webviewlib_PCH_INC) -D__WX$(TOOLKIT)__ \
 	$(__WXUNIV_DEFINE_p) $(__DEBUG_DEFINE_p) $(__EXCEPTIONS_DEFINE_p) \
 	$(__RTTI_DEFINE_p) $(__THREAD_DEFINE_p) -DWXBUILDING $(__INC_TIFF_BUILD_p) \
 	$(__INC_TIFF_p) $(__INC_JPEG_p) $(__INC_PNG_p) $(__INC_ZLIB_p) \
-	$(__INC_REGEX_p) $(__INC_EXPAT_p) $(CXXWARNINGS) $(CPPFLAGS) $(CXXFLAGS)
+	$(__INC_REGEX_p) $(__INC_EXPAT_p) $(__webviewdll_ext_dir_define_p) \
+	$(CXXWARNINGS) $(CPPFLAGS) $(CXXFLAGS)
 WEBVIEWLIB_OBJCXXFLAGS = $(__webviewlib_PCH_INC) -D__WX$(TOOLKIT)__ \
 	$(__WXUNIV_DEFINE_p) $(__DEBUG_DEFINE_p) $(__EXCEPTIONS_DEFINE_p) \
 	$(__RTTI_DEFINE_p) $(__THREAD_DEFINE_p) -DWXBUILDING $(__INC_TIFF_BUILD_p) \
 	$(__INC_TIFF_p) $(__INC_JPEG_p) $(__INC_PNG_p) $(__INC_ZLIB_p) \
-	$(__INC_REGEX_p) $(__INC_EXPAT_p) $(CPPFLAGS) $(OBJCXXFLAGS)
+	$(__INC_REGEX_p) $(__INC_EXPAT_p) $(__webviewdll_ext_dir_define_p) \
+	$(CPPFLAGS) $(OBJCXXFLAGS)
 WEBVIEWLIB_OBJECTS =  \
 	$(__WEBVIEW_SRC_PLATFORM_OBJECTS_3) \
 	webviewlib_webview.o \
@@ -13386,9 +13388,6 @@ COND_PLATFORM_MACOSX_1___OSX_LOWLEVEL_SRC_OBJECTS_17 =  \
 	monolib_core_timer.o \
 	monolib_utilsexc_cf.o
 @COND_PLATFORM_MACOSX_1@__OSX_LOWLEVEL_SRC_OBJECTS_17 = $(COND_PLATFORM_MACOSX_1___OSX_LOWLEVEL_SRC_OBJECTS_17)
-@COND_USE_WEBVIEW_WEBKIT2_1@__webviewdll_ext_dir_define_p \
-@COND_USE_WEBVIEW_WEBKIT2_1@	= \
-@COND_USE_WEBVIEW_WEBKIT2_1@	-DWX_WEB_EXTENSIONS_DIRECTORY=\"$(PLUGINS_INST_DIR)/web-extensions\"
 @COND_PLATFORM_MACOSX_1@__PLATFORM_SRC_OBJECTS_8 = coredll_unix_apptraits.o
 @COND_PLATFORM_UNIX_1@__PLATFORM_SRC_OBJECTS_8 = coredll_unix_apptraits.o
 COND_PLATFORM_MACOSX_1___OSX_COMMON_SRC_OBJECTS_8 =  \
@@ -13665,6 +13664,9 @@ COND_PLATFORM_MACOSX_1___OSX_LOWLEVEL_SRC_OBJECTS_1_4 =  \
 	corelib_core_timer.o \
 	corelib_utilsexc_cf.o
 @COND_PLATFORM_MACOSX_1@__OSX_LOWLEVEL_SRC_OBJECTS_1_4 = $(COND_PLATFORM_MACOSX_1___OSX_LOWLEVEL_SRC_OBJECTS_1_4)
+@COND_USE_WEBVIEW_WEBKIT2_1@__webviewdll_ext_dir_define_p \
+@COND_USE_WEBVIEW_WEBKIT2_1@	= \
+@COND_USE_WEBVIEW_WEBKIT2_1@	-DWX_WEB_EXTENSIONS_DIRECTORY=\"$(PLUGINS_INST_DIR)/web-extensions\"
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1_USE_HTML_1@__htmldll_library_link_DEP \
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1_USE_HTML_1@	= $(__htmldll___depname)
 @COND_MONOLITHIC_0_SHARED_1_USE_GUI_1_USE_HTML_1@__htmldll_library_link_LIBR \
diff --git a/build/bakefiles/multilib.bkl b/build/bakefiles/multilib.bkl
index 0aab9c3236..dedebdb51a 100644
--- a/build/bakefiles/multilib.bkl
+++ b/build/bakefiles/multilib.bkl
@@ -190,6 +190,7 @@
 
     <lib id="webviewlib" template="wx_lib"
          cond="SHARED=='0' and USE_GUI=='1' and USE_WEBVIEW=='1' and MONOLITHIC=='0'">
+        <define>$(webviewdll_ext_dir_define)</define>
         <sources>$(WEBVIEW_SRC)</sources>
         <msvc-headers>$(WEBVIEW_HDR)</msvc-headers>
     </lib>