diff --git a/Makefile b/Makefile
index 1e8c509..1190535 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # make clean && make && ./bin/cosmo
 
 CC=clang
-CFLAGS=-fPIE -Wall -O3 -std=c11
+CFLAGS=-fPIE -Wall -O3 -Isrc -std=c11
 LDFLAGS=-lm #-fsanitize=address
 OUT=bin/cosmo