diff --git a/os/emscripten/Dockerfile b/os/emscripten/Dockerfile
--- a/os/emscripten/Dockerfile
+++ b/os/emscripten/Dockerfile
@@ -2,3 +2,6 @@ FROM emscripten/emsdk:3.1.37
 
 COPY emsdk-liblzma.patch /
 RUN cd /emsdk/upstream/emscripten && patch -p1 < /emsdk-liblzma.patch
+
+COPY emsdk-nlohmann-json.patch /
+RUN cd /emsdk/upstream/emscripten && patch -p1 < /emsdk-nlohmann-json.patch