diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a99ccf5737..32f8aaaf3c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -391,6 +391,9 @@ else() # Linux
     if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
       message("Host processor is 64bit")
       sm_add_compile_definition("${SM_EXE_NAME}" CPU_X86_64)
+    else()
+      message("Host processor is 32bit")
+      sm_add_compile_definition("${SM_EXE_NAME}" CPU_X86)
     endif()
   endif()
   if (${HAS_FFMPEG})