diff --git a/ports/allegro5/portfile.cmake b/ports/allegro5/portfile.cmake
index 094219a83c5..a1d075727f8 100644
--- a/ports/allegro5/portfile.cmake
+++ b/ports/allegro5/portfile.cmake
@@ -70,7 +70,9 @@ vcpkg_configure_cmake(
         -DOPENAL_INCLUDE_DIR=${CURRENT_INSTALLED_DIR}/include/AL
         -DZLIB_INCLUDE_DIR=${CURRENT_INSTALLED_DIR}/include
     OPTIONS_RELEASE -DWANT_ALLOW_SSE=ON
-    OPTIONS_DEBUG -DWANT_ALLOW_SSE=OFF
+    OPTIONS_DEBUG
+        -DWANT_ALLOW_SSE=OFF
+        -DCMAKE_CXX_FLAGS_DEBUG="/D_DEBUG /MDd /Z7 /Ob0 /Od /RTC1"
 )
 
 vcpkg_install_cmake()