diff --git a/Makefile b/Makefile
index 4ee11259..f61249c1 100644
--- a/Makefile
+++ b/Makefile
@@ -115,7 +115,7 @@ all: chibi-scheme$(EXE) all-libs chibi-scheme.pc $(META_FILES)
 js: js/chibi.js
 
 js/chibi.js: chibi-scheme-emscripten chibi-scheme-static.bc js/pre.js js/post.js js/exported_functions.json
-	emcc -O3 chibi-scheme-static.bc -o $@ -s MODULARIZE=1 -s EXPORT_NAME=\"Chibi\" -s EXPORTED_FUNCTIONS=@js/exported_functions.json `find  lib -type f \( -name "*.scm" -or -name "*.sld" \) -printf " --preload-file %p"` --pre-js js/pre.js --post-js js/post.js
+	emcc -O3 chibi-scheme-static.bc -o $@ -s MODULARIZE=1 -s EXPORT_NAME=\"Chibi\" -s EXPORTED_FUNCTIONS=@js/exported_functions.json `find  lib -type f \( -name "*.scm" -or -name "*.sld" \) -printf " --preload-file %p"` -s 'EXTRA_EXPORTED_RUNTIME_METHODS=["ccall", "cwrap"]' --pre-js js/pre.js --post-js js/post.js
 
 chibi-scheme-static.bc:
 	emmake $(MAKE) PLATFORM=emscripten CHIBI_DEPENDENCIES= CHIBI=./chibi-scheme-emscripten PREFIX= CFLAGS=-O2 SEXP_USE_DL=0 EXE=.bc SO=.bc CPPFLAGS="-DSEXP_USE_STRICT_TOPLEVEL_BINDINGS=1 -DSEXP_USE_ALIGNED_BYTECODE=1 -DSEXP_USE_STATIC_LIBS=1 -DSEXP_USE_STATIC_LIBS_NO_INCLUDE=0" clibs.c chibi-scheme-static.bc
diff --git a/js/exported_functions.json b/js/exported_functions.json
index da719553..8b97a5c1 100644
--- a/js/exported_functions.json
+++ b/js/exported_functions.json
@@ -1,5 +1,4 @@
 [
-  '_main',
-  '_sexp_resume'
+    "_main",
+    "_sexp_resume"
 ]
-