How can I eliminate or reduce seams on my normal textures? (Image in post)

Hi all. I'm attempting to make a low poly rock, and as you can see in the image my normal map has a serious seam along the lower portion of the rock. The seam isn't visible on the color texture but once the model is exported back to blender or into other software the seam becomes a serious problem. What can I do to eliminate seams like this on my normal maps?