diff --git a/media/webrtc/trunk/moz.build b/media/webrtc/trunk/moz.build
index 73b10cb68619..b27ff8c5e7f3 100644
--- a/media/webrtc/trunk/moz.build
+++ b/media/webrtc/trunk/moz.build
@@ -84,7 +84,7 @@ DIRS += [
     "/media/webrtc/trunk/webrtc/webrtc_gn"
 ]
 
-if CONFIG["OS_TARGET"] == "WINNT":
+if CONFIG["OS_TARGET"] == "DragonFly":
 
     DIRS += [
         "/media/webrtc/trunk/webrtc/common_audio/common_audio_sse2_gn",
@@ -96,7 +96,7 @@ if CONFIG["OS_TARGET"] == "WINNT":
         "/media/webrtc/trunk/webrtc/video_engine/video_engine_gn"
     ]
 
-if CONFIG["OS_TARGET"] == "DragonFly":
+if CONFIG["OS_TARGET"] == "WINNT":
 
     DIRS += [
         "/media/webrtc/trunk/webrtc/common_audio/common_audio_sse2_gn",
diff --git a/media/webrtc/trunk/webrtc/common_audio/common_audio_sse2_gn/moz.build b/media/webrtc/trunk/webrtc/common_audio/common_audio_sse2_gn/moz.build
index 0c901a28e092..763c439e0690 100644
--- a/media/webrtc/trunk/webrtc/common_audio/common_audio_sse2_gn/moz.build
+++ b/media/webrtc/trunk/webrtc/common_audio/common_audio_sse2_gn/moz.build
@@ -122,6 +122,7 @@ if CONFIG["OS_TARGET"] == "NetBSD":
 if CONFIG["OS_TARGET"] == "OpenBSD":
 
     CXXFLAGS += [
+        "-msse2",
         "-msse2"
     ]
 
diff --git a/media/webrtc/trunk/webrtc/modules/audio_processing/audio_processing_sse2_gn/moz.build b/media/webrtc/trunk/webrtc/modules/audio_processing/audio_processing_sse2_gn/moz.build
index 5455c4a4e623..50aa160d620d 100644
--- a/media/webrtc/trunk/webrtc/modules/audio_processing/audio_processing_sse2_gn/moz.build
+++ b/media/webrtc/trunk/webrtc/modules/audio_processing/audio_processing_sse2_gn/moz.build
@@ -123,6 +123,7 @@ if CONFIG["OS_TARGET"] == "NetBSD":
 if CONFIG["OS_TARGET"] == "OpenBSD":
 
     CXXFLAGS += [
+        "-msse2",
         "-msse2"
     ]
 
diff --git a/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build b/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build
index d110306cebd7..8acbae366d9f 100644
--- a/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build
+++ b/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_capture_differ_sse2_gn/moz.build
@@ -101,6 +101,7 @@ if CONFIG["OS_TARGET"] == "NetBSD":
 if CONFIG["OS_TARGET"] == "OpenBSD":
 
     CXXFLAGS += [
+        "-msse2",
         "-msse2"
     ]
 
diff --git a/media/webrtc/trunk/webrtc/modules/video_processing/video_processing_sse2_gn/moz.build b/media/webrtc/trunk/webrtc/modules/video_processing/video_processing_sse2_gn/moz.build
index 1f23b90d3301..e078dd02c644 100644
--- a/media/webrtc/trunk/webrtc/modules/video_processing/video_processing_sse2_gn/moz.build
+++ b/media/webrtc/trunk/webrtc/modules/video_processing/video_processing_sse2_gn/moz.build
@@ -129,6 +129,7 @@ if CONFIG["OS_TARGET"] == "NetBSD":
 if CONFIG["OS_TARGET"] == "OpenBSD":
 
     CXXFLAGS += [
+        "-msse2",
         "-msse2"
     ]