Debugging opens disassembly view in a makefile application

When I try to debug my project, it opens it in disassembly view rather than the source code and therefore skips all the breakpoints put in place. I am new to C so this probably something that i'm doing wrong but i really need some help.

Here is a copy of my Makefile

TARGET = prog
CC = gcc
CFLAGS = -g -O0 -Wall -Wextra

all: $(TARGET)

$(TARGET): basic-test-suite.o matrix.o unity.o
   $(CC) $(CFLAGS) basic-test-suite.o matrix.o unity.o -o prog

basic-test-suite.o: basic-test-suite.c matrix.h unity.h
   $(CC) $(CFLAGS) -c basic-test-suite.c -o basic-test-suite.o

matrix.o: matrix.c matrix.h
   $(CC) $(CFLAGS) -c matrix.c -o matrix.o

unity.o: unity.c unity.h
   $(CC) $(CFLAGS) -c unity.c -o unity.o

clean:
   rm -rf *.o prog