diff --git a/wasm/src/CMakeLists.txt b/wasm/src/CMakeLists.txt
index 0f72b4928..390e2645c 100644
--- a/wasm/src/CMakeLists.txt
+++ b/wasm/src/CMakeLists.txt
@@ -39,7 +39,7 @@ IF (ASMJS)
   set(CMAKE_EXECUTABLE_SUFFIX ".js")
   set(EMC_PROPS "${EMC_PROPS} -s FINALIZE_ASM_JS=1  -s SEPARATE_ASM=1 -s WASM=0 -s ASM_JS=1 ")
 else(ASMJS)
-  set(EMC_PROPS "${EMC_PROPS} WASM=1")
+  set(EMC_PROPS "${EMC_PROPS} -s WASM=1")
 endif(ASMJS)