diff --git a/src/libImaging/GetBBox.c b/src/libImaging/GetBBox.c
index 2e8afc8d5..50b2253a0 100644
--- a/src/libImaging/GetBBox.c
+++ b/src/libImaging/GetBBox.c
@@ -53,6 +53,8 @@ ImagingGetBBox(Imaging im, int bbox[4], int alpha_only) {
         for (x = 0; x < im->xsize; x++)                      \
             if (im->image[y][x] & mask) {                    \
                 has_data = 1;                                \
+                if (x < bbox[0])                             \
+                    bbox[0] = x;                             \
                 bbox[3] = y + 1;                             \
                 break;                                       \
             }                                                \