--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -137,7 +137,7 @@
 set (COMPILE_OPTIONS_TD  opencl_clang_options.td)
 set (COMPILE_OPTIONS_INC opencl_clang_options.inc)
 
-set(LLVM_TABLEGEN_EXE "llvm-tblgen")
+find_program(LLVM_TABLEGEN_EXE "llvm-tblgen")
 set(LLVM_TARGET_DEFINITIONS ${COMPILE_OPTIONS_TD})
 if(USE_PREBUILT_LLVM)
   set(TABLEGEN_ADDITIONAL -I ${LLVM_INCLUDE_DIRS})