diff --git a/src/libImaging/Filter.c b/src/libImaging/Filter.c
index 7b7b2e429..48f210809 100644
--- a/src/libImaging/Filter.c
+++ b/src/libImaging/Filter.c
@@ -155,9 +155,9 @@ ImagingFilter3x3(Imaging imOut, Imaging im, const float *kernel, float offset) {
         } else {
             int bigendian = 0;
             if (im->type == IMAGING_TYPE_SPECIAL) {
-                if (strcmp(im->mode, "I;16B") == 0
+                if (im->mode == IMAGING_MODE_I_16B
 #ifdef WORDS_BIGENDIAN
-                    || strcmp(im->mode, "I;16N") == 0
+                    || im->mode == IMAGING_MODE_I_16N
 #endif
                 ) {
                     bigendian = 1;
@@ -308,9 +308,9 @@ ImagingFilter5x5(Imaging imOut, Imaging im, const float *kernel, float offset) {
         } else {
             int bigendian = 0;
             if (im->type == IMAGING_TYPE_SPECIAL) {
-                if (strcmp(im->mode, "I;16B") == 0
+                if (im->mode == IMAGING_MODE_I_16B
 #ifdef WORDS_BIGENDIAN
-                    || strcmp(im->mode, "I;16N") == 0
+                    || im->mode == IMAGING_MODE_I_16N
 #endif
                 ) {
                     bigendian = 1;