diff --git a/CMakeLists.txt b/CMakeLists.txt
index 937b17f51..af0d2300f 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,7 +82,7 @@ ENDIF()
 
 IF(NOT CMAKE_SYSTEM_NAME)
   MESSAGE(FATAL_ERROR "CMAKE_SYSTEM_NAME not defined")
-ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Darwin|Linux|Android|Windows|CYGWIN|MSYS)$")
+ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Darwin|Linux|Android|Windows|CYGWIN|MSYS|Emscripten)$")
   MESSAGE(FATAL_ERROR "Unrecognized CMAKE_SYSTEM_NAME = ${CMAKE_SYSTEM_NAME}")
 ENDIF()