diff --git a/data-structures/trees/binary-tree/c/Makefile b/data-structures/trees/binary-tree/c/Makefile
index e887b70..280ffd3 100644
--- a/data-structures/trees/binary-tree/c/Makefile
+++ b/data-structures/trees/binary-tree/c/Makefile
@@ -5,7 +5,7 @@ RELEASE_FLAGS = -Wall -Wextra -DNDEBUG
 # LFLAGS = -lpthread
 
 # Source files
-SRCS = main.c
+SRCS = main.c binary-tree.c
 
 # Object files definition
 OBJS = $(SRCS:.c=.o)