diff --git a/Modules/Compiler/TinyCC-C.cmake b/Modules/Compiler/TinyCC-C.cmake
index bb27eadde..4a48c0af5 100644
--- a/Modules/Compiler/TinyCC-C.cmake
+++ b/Modules/Compiler/TinyCC-C.cmake
@@ -1 +1,8 @@
 SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared")
+
+# no optimization in tcc:
+SET (CMAKE_C_FLAGS_INIT "")
+SET (CMAKE_C_FLAGS_DEBUG_INIT "-g")
+SET (CMAKE_C_FLAGS_MINSIZEREL_INIT "-DNDEBUG")
+SET (CMAKE_C_FLAGS_RELEASE_INIT "-DNDEBUG")
+SET (CMAKE_C_FLAGS_RELWITHDEBINFO_INIT "-g")