diff --git a/build_android.sh b/build_android.sh
index 93773568..91b25d76 100644
--- a/build_android.sh
+++ b/build_android.sh
@@ -1,3 +1,5 @@
+set -e
+
 # if no $1 default arm64-v8a
 if [ -z $1 ]; then
     $1=arm64-v8a
diff --git a/build_ios.sh b/build_ios.sh
index 7b63bba7..3c4d8fe1 100644
--- a/build_ios.sh
+++ b/build_ios.sh
@@ -1,3 +1,5 @@
+set -e
+
 rm -rf build
 mkdir build
 cd build
diff --git a/build_web.sh b/build_web.sh
index f3006c45..ae039479 100644
--- a/build_web.sh
+++ b/build_web.sh
@@ -1,10 +1,10 @@
+set -e
+
 python prebuild.py
 
 rm -rf web/lib
 mkdir web/lib
 
-SRC_C=$(find src/ -name "*.c")
-SRC_CPP=$(find src/ -name "*.cpp")
-SRC="$SRC_C $SRC_CPP"
+SRC=$(find src/ -name "*.c")
 
-em++ $SRC -Iinclude/ -fexceptions -frtti -s -Os -sEXPORTED_FUNCTIONS=_pkpy_new_repl,_pkpy_repl_input,_pkpy_new_vm -sEXPORTED_RUNTIME_METHODS=ccall -o web/lib/pocketpy.js
+emcc $SRC -Iinclude/ -s -Os -sEXPORTED_FUNCTIONS=_py_initialize,_py_finalize,_py_exec,_py_replinput -sEXPORTED_RUNTIME_METHODS=ccall -o web/lib/pocketpy.js