diff --git a/src/_imaging.c b/src/_imaging.c
index 62e51da26..87f5b6705 100644
--- a/src/_imaging.c
+++ b/src/_imaging.c
@@ -2163,12 +2163,12 @@ static PyObject *
 _getbbox(ImagingObject *self, PyObject *args) {
     int bbox[4];
 
-    int consider_alpha = 1;
-    if (!PyArg_ParseTuple(args, "|i", &consider_alpha)) {
+    int alpha_only = 1;
+    if (!PyArg_ParseTuple(args, "|i", &alpha_only)) {
         return NULL;
     }
 
-    if (!ImagingGetBBox(self->image, bbox, consider_alpha)) {
+    if (!ImagingGetBBox(self->image, bbox, alpha_only)) {
         Py_INCREF(Py_None);
         return Py_None;
     }
diff --git a/src/libImaging/GetBBox.c b/src/libImaging/GetBBox.c
index c1570cd3e..86c687ca0 100644
--- a/src/libImaging/GetBBox.c
+++ b/src/libImaging/GetBBox.c
@@ -19,7 +19,7 @@
 #include "Imaging.h"
 
 int
-ImagingGetBBox(Imaging im, int bbox[4], int consider_alpha) {
+ImagingGetBBox(Imaging im, int bbox[4], int alpha_only) {
     /* Get the bounding box for any non-zero data in the image.*/
 
     int x, y;
@@ -58,7 +58,7 @@ ImagingGetBBox(Imaging im, int bbox[4], int consider_alpha) {
         INT32 mask = 0xffffffff;
         if (im->bands == 3) {
             ((UINT8 *)&mask)[3] = 0;
-        } else if (consider_alpha && (
+        } else if (alpha_only && (
             strcmp(im->mode, "RGBa") == 0 || strcmp(im->mode, "RGBA") == 0 ||
             strcmp(im->mode, "La") == 0 || strcmp(im->mode, "LA") == 0 ||
             strcmp(im->mode, "PA") == 0
diff --git a/src/libImaging/Imaging.h b/src/libImaging/Imaging.h
index 2563a0c62..42420887d 100644
--- a/src/libImaging/Imaging.h
+++ b/src/libImaging/Imaging.h
@@ -317,7 +317,7 @@ ImagingMerge(const char *mode, Imaging bands[4]);
 extern int
 ImagingSplit(Imaging im, Imaging bands[4]);
 extern int
-ImagingGetBBox(Imaging im, int bbox[4], int consider_alpha);
+ImagingGetBBox(Imaging im, int bbox[4], int alpha_only);
 typedef struct {
     int x, y;
     INT32 count;