diff --git a/cmph/meson.build b/cmph/meson.build
index 6b515241f..d7b1e4230 100644
--- a/cmph/meson.build
+++ b/cmph/meson.build
@@ -38,6 +38,7 @@ custom_c_args = cc.get_supported_arguments([
   '-Wno-unused-parameter',
   '-Wno-cast-align',
   '-Wno-unused-function',
+  '-Wno-return-type',
 ])
 cmph = static_library('cmph',
   sources: cmph_sources,
diff --git a/girepository.c b/girepository.c
index 8bc49eb16..e262d3e8d 100644
--- a/girepository.c
+++ b/girepository.c
@@ -76,6 +76,8 @@ static HMODULE girepository_dll = NULL;
 
 #ifdef DLL_EXPORT
 
+BOOL WINAPI DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved);
+
 BOOL WINAPI
 DllMain (HINSTANCE hinstDLL,
 	 DWORD     fdwReason,