diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b7ecba..f3eacc8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,7 +63,7 @@ if (HAVE_STRERROR_R)
 endif()
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/utils_config.h.in" "${CMAKE_CURRENT_BINARY_DIR}/utils_config.h")
 
-if (${CMAKE_C_COMPILER_ID} STREQUAL GNU)
+if ("${CMAKE_C_COMPILER_ID}" STREQUAL GNU)
     add_compile_options(-fPIC)
 endif()