diff --git a/dom/media/eme/MediaKeySystemAccess.cpp b/dom/media/eme/MediaKeySystemAccess.cpp
index 1a12708784d0..06ca391a1f9e 100644
--- a/dom/media/eme/MediaKeySystemAccess.cpp
+++ b/dom/media/eme/MediaKeySystemAccess.cpp
@@ -10,6 +10,9 @@
 #include "mozilla/Preferences.h"
 #include "MediaContainerType.h"
 #include "MediaPrefs.h"
+#ifdef MOZ_FMP4
+#include "MP4Decoder.h"
+#endif
 #ifdef XP_WIN
 #include "WMFDecoderModule.h"
 #endif
diff --git a/dom/media/eme/MediaKeys.cpp b/dom/media/eme/MediaKeys.cpp
index 8b91fdc7bc4a..7a79cfff3a13 100644
--- a/dom/media/eme/MediaKeys.cpp
+++ b/dom/media/eme/MediaKeys.cpp
@@ -23,6 +23,9 @@
 #include "nsContentUtils.h"
 #include "nsIScriptObjectPrincipal.h"
 #include "nsContentTypeParser.h"
+#ifdef MOZ_FMP4
+#include "MP4Decoder.h"
+#endif
 #ifdef XP_WIN
 #include "mozilla/WindowsVersion.h"
 #endif
diff --git a/dom/media/gtest/TestMediaDataDecoder.cpp b/dom/media/gtest/TestMediaDataDecoder.cpp
index 341c05e29426..4beba01a7f5a 100644
--- a/dom/media/gtest/TestMediaDataDecoder.cpp
+++ b/dom/media/gtest/TestMediaDataDecoder.cpp
@@ -8,6 +8,7 @@
 #include "MockMediaResource.h"
 #include "DecoderTraits.h"
 #include "MediaContainerType.h"
+#include "MP4Decoder.h"
 #include "MP4Demuxer.h"
 #include "WebMDecoder.h"
 #include "WebMDemuxer.h"
diff --git a/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp b/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp
index fe1d18975eea..2072b7f1107c 100644
--- a/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp
+++ b/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp
@@ -8,6 +8,7 @@
 #include "EMEVideoDecoder.h"
 #include "GMPDecoderModule.h"
 #include "GMPService.h"
+#include "MP4Decoder.h"
 #include "MediaInfo.h"
 #include "MediaPrefs.h"
 #include "PDMFactory.h"