diff --git a/demos/gears.c b/demos/gears.c
index ab90e0d4..5809648e 100644
--- a/demos/gears.c
+++ b/demos/gears.c
@@ -888,6 +888,9 @@ static int cxg_main(void)
 }
 
 #ifdef _WIN32
+/* Do not trigger -Wmissing-prototypes. */
+int wmain(void);
+
 int wmain(void)
 #else
 int main(void)
diff --git a/demos/triangle.c b/demos/triangle.c
index b331da0c..79257ed8 100644
--- a/demos/triangle.c
+++ b/demos/triangle.c
@@ -401,6 +401,9 @@ static int cxt_main(void)
 }
 
 #ifdef _WIN32
+/* Do not trigger -Wmissing-prototypes. */
+int wmain(void);
+
 int wmain(void)
 #else
 int main(void)
diff --git a/gitlab/build-mingw b/gitlab/build-mingw
index c9d3b9f7..383f9c4b 100755
--- a/gitlab/build-mingw
+++ b/gitlab/build-mingw
@@ -13,7 +13,7 @@ mkdir build
 cd build
 mkdir vulkan-headers
 cp -r /usr/include/vulkan /usr/include/vk_video /usr/include/spirv vulkan-headers
-../configure --enable-demos --disable-doxygen-doc --without-ncurses --host=$HOST SONAME_LIBVULKAN="vulkan-1.dll" CPPFLAGS="-I$PWD/vulkan-headers" CFLAGS="-g -O2 -Wno-format -Wno-array-bounds -Wno-missing-prototypes -Wno-incompatible-pointer-types -Werror" LDFLAGS="-static-libgcc" && \
+../configure --enable-demos --disable-doxygen-doc --without-ncurses --host=$HOST SONAME_LIBVULKAN="vulkan-1.dll" CPPFLAGS="-I$PWD/vulkan-headers" CFLAGS="-g -O2 -Wno-format -Wno-array-bounds -Wno-incompatible-pointer-types -Werror" LDFLAGS="-static-libgcc" && \
     make -j$(nproc) && \
     make -j$(nproc) install DESTDIR="$PWD/destdir" || \
         touch ../pipeline_failed