diff --git a/aegisub/build/ffmpeg/ffmpeg.vcxproj b/aegisub/build/ffmpeg/ffmpeg.vcxproj
index 838b63ac2..ec79673e0 100644
--- a/aegisub/build/ffmpeg/ffmpeg.vcxproj
+++ b/aegisub/build/ffmpeg/ffmpeg.vcxproj
@@ -33,6 +33,7 @@
       --disable-pthreads
       --disable-shared
       --disable-swresample
+      --enable-avresample
       --enable-gpl
       --enable-runtime-cpudetect
       --enable-static
diff --git a/aegisub/build/ffms2/ffms2.vcxproj b/aegisub/build/ffms2/ffms2.vcxproj
index 5924bcc43..9bbbabad6 100644
--- a/aegisub/build/ffms2/ffms2.vcxproj
+++ b/aegisub/build/ffms2/ffms2.vcxproj
@@ -22,6 +22,7 @@
         %(AdditionalIncludeDirectories)
       </AdditionalIncludeDirectories>
       <PreprocessorDefinitions>
+        WITH_AVRESAMPLE;
         FFMS_EXPORTS;
         HAALISOURCE;
         _CRT_SECURE_NO_WARNINGS;