diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d7bbe9..2ec17c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,10 @@
 cmake_minimum_required(VERSION 3.11)
 project(assaultfish)
 
+if(NOT CMAKE_BUILD_TYPE)
+	set(CMAKE_BUILD_TYPE Release)
+endif()
+
 include(GNUInstallDirs)
 set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_FULL_LIBDIR}")
 set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
diff --git a/engine/CMakeLists.txt b/engine/CMakeLists.txt
index 9a6773e..23ad98a 100644
--- a/engine/CMakeLists.txt
+++ b/engine/CMakeLists.txt
@@ -25,6 +25,10 @@ if(NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
 	target_link_libraries(GearSrc PRIVATE m)
 endif()
 
+if(CMAKE_BUILD_TYPE MATCHES Debug)
+	target_compile_definitions(GearSrc PRIVATE DEBUG)
+endif()
+
 install_target(GearSrc)
 install(
 	DIRECTORY include/
diff --git a/engine/src/log.c b/engine/src/log.c
index d0b260d..8e9fab4 100644
--- a/engine/src/log.c
+++ b/engine/src/log.c
@@ -4,6 +4,10 @@ void GSLog(int level, const char* fmt, ...) {
 	va_list va;
 	FILE*	out = stdout;
 
+#ifndef DEBUG
+	if(level == GSLogDebug) return;
+#endif
+
 #ifdef _WIN32
 	fprintf(out, "[GearSrc|");