"undefined reference" error when compiling in C

I have a simple program where when compiling of an error

  

undefined reference to 'increment' |

main.c :

#include <stdio.h>
#include "incrementar.h"

int main()
{
    printf("Numero incrementado%d!", incrementar(10));
    return 0;
}


incrementar.h:

int incrementar(int i)
{
    return i++;
}



incrementar.c:

int incrementar(int i)
{
    return i++;
}

Note: I'm using Code :: Blocks.