diff --git a/Makefile b/Makefile
index 4cd2c87..267c649 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 # Compiler and flags
 CXX = g++
-CXXFLAGS = -Wall -Wextra -g -ggdb3 -std=c++14 -I./src -isystem./ext/raylib/src -I./ext/tomlc17/src -I./ext/raygui/src
+CXXFLAGS = -Wall -Wextra -g -ggdb3 -std=c++14 -I./src -isystem./ext/raylib/src -I./ext/tomlc17/src -isystem./ext/raygui/src
 LDFLAGS = -L./ext/raylib/src -lraylib -lm -lpthread -ldl -lrt -lX11
 
 # Directories