diff --git a/bin/makefile-emscripten.wasm-wasm b/bin/makefile-emscripten.wasm-wasm
index 3486fa5..2551634 100644
--- a/bin/makefile-emscripten.wasm-wasm
+++ b/bin/makefile-emscripten.wasm-wasm
@@ -1,6 +1,6 @@
 # Options for Emscripten, WASM and SDL
 
-CC = emcc $(CLANG_CFLAGS) -lidbfs.js
+CC = emcc $(CLANG_CFLAGS)
 
 XFILES = $(OBJECTDIR)sdl.o
 
@@ -8,9 +8,9 @@ XFLAGS = -DSDL -sUSE_SDL=2
 
 # OPTFLAGS is normally -O2.
 OPTFLAGS = -O2
-DFLAGS = $(XFLAGS) -DRELEASE=351 -DMAIKO_ENABLE_NETHUB
+DFLAGS = $(XFLAGS) -DRELEASE=351 -DMAIKO_OS_EMSCRIPTEN -DMAIKO_ENABLE_NETHUB
 
-LD = emcc -sLZ4
+LD = emcc
 LDFLAGS = -sUSE_SDL=2 -sASYNCIFY -sALLOW_MEMORY_GROWTH -sEXIT_RUNTIME=1 -sFORCE_FILESYSTEM -sLZ4
 UPFRONT_LDFLAGS = -lidbfs.js