diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index 0b59ff4..25a07b0 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -2557,6 +2557,7 @@
  * @dst: pointer to the #igt_fb structure that will store the conversion result
  * @src: pointer to the #igt_fb structure that stores the frame we convert
  * @dst_fourcc: DRM format specifier to convert to
+ * @dst_modifier: DRM format modifier to convert to
  * @dst_stride: Stride for the resulting framebuffer (0 for automatic stride)
  *
  * This will convert a given @src content to the @dst_fourcc format,
@@ -2571,6 +2572,7 @@
  */
 unsigned int igt_fb_convert_with_stride(struct igt_fb *dst, struct igt_fb *src,
 					uint32_t dst_fourcc,
+					uint64_t dst_modifier,
 					unsigned int dst_stride)
 {
 	struct fb_convert cvt = { };
@@ -2579,8 +2581,8 @@
 
 	fb_id = igt_create_fb_with_bo_size(src->fd, src->width, src->height,
 					   dst_fourcc,
-					   LOCAL_DRM_FORMAT_MOD_NONE,
-					   dst, 0, dst_stride);
+					   LOCAL_DRM_FORMAT_MOD_NONE, dst, 0,
+					   dst_stride);
 	igt_assert(fb_id > 0);
 
 	src_ptr = igt_fb_map_buffer(src->fd, src);
@@ -2598,6 +2600,8 @@
 	igt_fb_unmap_buffer(dst, dst_ptr);
 	igt_fb_unmap_buffer(src, src_ptr);
 
+	igt_assert(dst_modifier == LOCAL_DRM_FORMAT_MOD_NONE);
+
 	return fb_id;
 }
 
@@ -2606,6 +2610,7 @@
  * @dst: pointer to the #igt_fb structure that will store the conversion result
  * @src: pointer to the #igt_fb structure that stores the frame we convert
  * @dst_fourcc: DRM format specifier to convert to
+ * @dst_modifier: DRM format modifier to convert to
  *
  * This will convert a given @src content to the @dst_fourcc format,
  * storing the result in the @dst fb, allocating the @dst fb
@@ -2618,9 +2623,10 @@
  * The kms id of the created framebuffer.
  */
 unsigned int igt_fb_convert(struct igt_fb *dst, struct igt_fb *src,
-			    uint32_t dst_fourcc)
+			    uint32_t dst_fourcc, uint64_t dst_modifier)
 {
-	return igt_fb_convert_with_stride(dst, src, dst_fourcc, 0);
+	return igt_fb_convert_with_stride(dst, src, dst_fourcc, dst_modifier,
+					  0);
 }
 
 /**
diff --git a/lib/igt_fb.h b/lib/igt_fb.h
index 2c0a24d..e1d885e 100644
--- a/lib/igt_fb.h
+++ b/lib/igt_fb.h
@@ -138,9 +138,10 @@
 				  uint32_t format, uint64_t tiling);
 unsigned int igt_fb_convert_with_stride(struct igt_fb *dst, struct igt_fb *src,
 					uint32_t dst_fourcc,
+					uint64_t dst_modifier,
 					unsigned int stride);
 unsigned int igt_fb_convert(struct igt_fb *dst, struct igt_fb *src,
-			    uint32_t dst_fourcc);
+			    uint32_t dst_fourcc, uint64_t dst_modifier);
 void igt_remove_fb(int fd, struct igt_fb *fb);
 int igt_dirty_fb(int fd, struct igt_fb *fb);
 void *igt_fb_map_buffer(int fd, struct igt_fb *fb);
diff --git a/tests/kms_chamelium.c b/tests/kms_chamelium.c
index 64f87d3..fe58aea 100644
--- a/tests/kms_chamelium.c
+++ b/tests/kms_chamelium.c
@@ -546,7 +546,8 @@
 					 DRM_FORMAT_XRGB8888, 64, &fb);
 	igt_assert(fb_id > 0);
 
-	frame_id = igt_fb_convert(&frame_fb, &fb, fourcc);
+	frame_id = igt_fb_convert(&frame_fb, &fb, fourcc,
+				  LOCAL_DRM_FORMAT_MOD_NONE);
 	igt_assert(frame_id > 0);
 
 	if (check == CHAMELIUM_CHECK_CRC)