diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index beb39bdb67..f27f798c2a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -294,9 +294,11 @@ else() # Linux
     if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
       message("Host processor is 64bit")
       sm_add_compile_definition("${SM_EXE_NAME}" CPU_X86_64)
-    else()
+    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "x86")
       message("Host processor is 32bit")
       sm_add_compile_definition("${SM_EXE_NAME}" CPU_X86)
+    else()
+      message("Unrecognized host processor type")
     endif()
   endif()
   if (${HAS_FFMPEG})