I am trying to have cell in colum A summed IF the corresponding cell in colum
B is the same as a specific cell D4.  Data looks like this.

Data to be summed    If cells here are the same as     The cells here
55                                                    1    0
5                                                     0    1
5                                                     1    2
3                                                    0    3
32                                                    0    4
88                                                     0    5

My forumla looks like this, but it keeps returning Zeros.  
=SUMIF(M$8:M$1051,"=I8",L$8:L$1051)

What am I doing wrong?  Something is wrong with the "=I8" piece.

thanks!