diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1dbfee..a34c5e2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -64,7 +64,7 @@ target_compile_definitions(i3ipc++
 	PRIVATE I3IPC_BUILD_DATETIME="${I3IPCppBUILD_DATETIME}"
 )
 
-if (CMAKE_BUILD_TYPE EQUAL "DEBUG")
+if (CMAKE_BUILD_TYPE STREQUAL "DEBUG")
 	target_compile_options(i3ipc++
 		PUBLIC -g3
 	)