diff --git a/image/DecoderFactory.h b/image/DecoderFactory.h
index 05e720a347..4267b1f809 100644
--- a/image/DecoderFactory.h
+++ b/image/DecoderFactory.h
@@ -15,7 +15,8 @@
 #include "nsCOMPtr.h"
 #include "SurfaceFlags.h"
 
-namespace mozilla::image {
+namespace mozilla {
+namespace image {
 
 class Decoder;
 class IDecodingTask;
@@ -200,6 +201,7 @@ private:
                                               bool aIsRedecode);
 };
 
-} // namespace mozilla::image
+} // namespace image
+} // namespace mozilla
 
 #endif // mozilla_image_DecoderFactory_h
diff --git a/image/decoders/nsJXLDecoder.cpp b/image/decoders/nsJXLDecoder.cpp
index e0e3407557..07a7849e28 100644
--- a/image/decoders/nsJXLDecoder.cpp
+++ b/image/decoders/nsJXLDecoder.cpp
@@ -17,7 +17,8 @@
 
 using namespace mozilla::gfx;
 
-namespace mozilla::image {
+namespace mozilla {
+namespace image {
 
 #define JXL_TRY(expr)                        \
   do {                                       \
@@ -162,4 +163,5 @@ nsJXLDecoder::FinishedJXLData()
   return Transition::TerminateFailure();
 }
 
-}  // namespace mozilla::image
+}  // namespace image
+}  // namespace mozilla
diff --git a/image/decoders/nsJXLDecoder.h b/image/decoders/nsJXLDecoder.h
index d4a1abe7f8..f6eaf7e648 100644
--- a/image/decoders/nsJXLDecoder.h
+++ b/image/decoders/nsJXLDecoder.h
@@ -13,7 +13,8 @@
 #include "jxl/decode_cxx.h"
 #include "jxl/thread_parallel_runner_cxx.h"
 
-namespace mozilla::image {
+namespace mozilla {
+namespace image {
 class RasterImage;
 
 class nsJXLDecoder final : public Decoder {
@@ -45,6 +46,7 @@ class nsJXLDecoder final : public Decoder {
   JxlBasicInfo mInfo{};
 };
 
-}  // namespace mozilla::image
+}  // namespace image
+}  // namespace mozilla
 
 #endif  // mozilla_image_decoders_nsJXLDecoder_h