diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index 158092b6ecf..a9abf3938fd 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -420,7 +420,7 @@ isl_device_init(struct isl_device *dev,
  * supported.
  */
 isl_sample_count_mask_t ATTRIBUTE_CONST
-isl_device_get_sample_counts(struct isl_device *dev)
+isl_device_get_sample_counts(const struct isl_device *dev)
 {
    if (ISL_GFX_VER(dev) >= 9) {
       return ISL_SAMPLE_COUNT_1_BIT |
diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index 01b33cbd432..d4c4f1f777c 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1927,7 +1927,7 @@ isl_device_init(struct isl_device *dev,
                 const struct intel_device_info *info);
 
 isl_sample_count_mask_t ATTRIBUTE_CONST
-isl_device_get_sample_counts(struct isl_device *dev);
+isl_device_get_sample_counts(const struct isl_device *dev);
 
 /**
  * :returns: The isl_format_layout for the given isl_format