diff --git a/src/encode_coding_tree.c b/src/encode_coding_tree.c
index 79756712..d0dab272 100644
--- a/src/encode_coding_tree.c
+++ b/src/encode_coding_tree.c
@@ -1103,7 +1103,7 @@ void uvg_encode_intra_luma_coding_unit(const encoder_state_t * const state,
 
   bool enable_isp = state->encoder_control->cfg.isp;
   // Need at least 16 samples in sub blocks to use isp. If both dimensions are 4, not enough samples. Blocks of size 2 do not exist yet (not for luma at least)
-  bool allow_isp = enable_isp ? uvg_can_use_isp(width, height, 64 /*MAX_TR_SIZE*/) : false;
+  bool allow_isp = enable_isp ? uvg_can_use_isp(width, height) : false;
   uint8_t isp_mode = allow_isp ? cur_cu->intra.isp_mode : 0;
 
   if (allow_isp && !multi_ref_idx /*&& !bdpcm && !color_transform*/) {
diff --git a/src/intra.c b/src/intra.c
index e6ccb77a..7eb07911 100644
--- a/src/intra.c
+++ b/src/intra.c
@@ -1851,7 +1851,7 @@ void uvg_intra_recon_cu(
 * \param height       Block height.
 * \param max_tr_size  Maximum supported transform block size (64).
 */
-bool uvg_can_use_isp(const int width, const int height, const int max_tr_size)
+bool uvg_can_use_isp(const int width, const int height)
 {
   assert(!(width > LCU_WIDTH || height > LCU_WIDTH) && "Block size larger than max LCU size.");
   assert(!(width < TR_MIN_WIDTH || height < TR_MIN_WIDTH) && "Block size smaller than min TR_WIDTH.");
@@ -1861,7 +1861,7 @@ bool uvg_can_use_isp(const int width, const int height, const int max_tr_size)
 
   // Each split block must have at least 16 samples.
   bool not_enough_samples = (log2_width + log2_height <= 4);
-  bool cu_size_larger_than_max_tr_size = width > max_tr_size || height > max_tr_size;
+  bool cu_size_larger_than_max_tr_size = width > TR_MAX_WIDTH || height > TR_MAX_WIDTH;
   if (not_enough_samples || cu_size_larger_than_max_tr_size) {
     return false;
   }
diff --git a/src/intra.h b/src/intra.h
index ac076327..c4bdc87e 100644
--- a/src/intra.h
+++ b/src/intra.h
@@ -174,5 +174,5 @@ int uvg_get_mip_flag_context(int x, int y, int width, int height, const lcu_t* l
 int uvg_get_isp_split_dim(const int width, const int height, const int split_type, const bool is_transform_block);
 int uvg_get_isp_split_num(const int width, const int height, const int split_type, const bool is_transform_block);
 void uvg_get_isp_split_loc(cu_loc_t *loc, const int x, const int y, const int block_w, const int block_h, int split_idx, const int split_type, const bool is_transform_block);
-bool uvg_can_use_isp(const int width, const int height, const int max_tr_size);
+bool uvg_can_use_isp(const int width, const int height);
 bool uvg_can_use_isp_with_lfnst(const int width, const int height, const int isp_mode, const enum uvg_tree_type tree_type);
diff --git a/src/search_intra.c b/src/search_intra.c
index 50baded9..224482dc 100644
--- a/src/search_intra.c
+++ b/src/search_intra.c
@@ -1392,7 +1392,7 @@ static int8_t search_intra_rdo(
     double best_isp_cost = MAX_DOUBLE;
     double best_bits = MAX_DOUBLE;
     int8_t best_isp_mode = -1;
-    int max_isp_modes = can_do_isp_search && uvg_can_use_isp(width, height, TR_MAX_WIDTH) && state->encoder_control->cfg.isp ? NUM_ISP_MODES : 1;
+    int max_isp_modes = can_do_isp_search && uvg_can_use_isp(width, height) && state->encoder_control->cfg.isp ? NUM_ISP_MODES : 1;
 
     for (int isp_mode = 0; isp_mode < max_isp_modes; ++isp_mode) {
       search_data[mode].pred_cu.intra.isp_mode = isp_mode;