diff --git a/ISLE/emscripten/libwasmfs_fetch.js.patch b/ISLE/emscripten/emscripten.patch
similarity index 88%
rename from ISLE/emscripten/libwasmfs_fetch.js.patch
rename to ISLE/emscripten/emscripten.patch
index de8fab60..899d72eb 100644
--- a/ISLE/emscripten/libwasmfs_fetch.js.patch
+++ b/ISLE/emscripten/emscripten.patch
@@ -1,3 +1,16 @@
+diff --git a/src/lib/libpthread.js b/src/lib/libpthread.js
+index 6d979627e..97e3f8684 100644
+--- a/src/lib/libpthread.js
++++ b/src/lib/libpthread.js
+@@ -697,7 +697,7 @@ var LibraryPThread = {
+     {
+       transferredCanvasNames = UTF8ToString(transferredCanvasNames).trim();
+     }
+-    transferredCanvasNames = transferredCanvasNames ? transferredCanvasNames.split(',') : [];
++    transferredCanvasNames = transferredCanvasNames && !Module['disableOffscreenCanvases'] ? transferredCanvasNames.split(',') : [];
+ #if GL_DEBUG
+     dbg(`pthread_create: transferredCanvasNames="${transferredCanvasNames}"`);
+ #endif
 diff --git a/src/lib/libwasmfs_fetch.js b/src/lib/libwasmfs_fetch.js
 index e8c9f7e21..caf1971d2 100644
 --- a/src/lib/libwasmfs_fetch.js
diff --git a/docker/emscripten/Dockerfile b/docker/emscripten/Dockerfile
index f234e9ed..a213093c 100644
--- a/docker/emscripten/Dockerfile
+++ b/docker/emscripten/Dockerfile
@@ -16,10 +16,10 @@ RUN chown -R emscripten:emscripten /src
 
 USER emscripten
 
-COPY ISLE/emscripten/libwasmfs_fetch.js.patch /tmp/
+COPY ISLE/emscripten/emscripten.patch /tmp/
 RUN cd /emsdk/upstream/emscripten && \
-    git apply --check /tmp/libwasmfs_fetch.js.patch && \
-    git apply /tmp/libwasmfs_fetch.js.patch
+    git apply --check /tmp/emscripten.patch && \
+    git apply /tmp/emscripten.patch
 
 COPY --chown=emscripten:emscripten 3rdparty/ ./3rdparty/
 COPY --chown=emscripten:emscripten LEGO1/ ./LEGO1/