diff --git a/src/amd/compiler/aco_register_allocation.cpp b/src/amd/compiler/aco_register_allocation.cpp
index 734e20b364f..437cf4998f0 100644
--- a/src/amd/compiler/aco_register_allocation.cpp
+++ b/src/amd/compiler/aco_register_allocation.cpp
@@ -379,16 +379,16 @@ UNUSED void
 print_reg(const RegisterFile& reg_file, PhysReg reg, bool has_adjacent_variable)
 {
    if (reg_file[reg] == 0xFFFFFFFF) {
-      printf("☐");
+      printf(u8"☐");
    } else if (reg_file[reg]) {
       const bool show_subdword_alloc = (reg_file[reg] == 0xF0000000);
       if (show_subdword_alloc) {
          const char* block_chars[] = {
             // clang-format off
-            "?", "▘", "▝", "▀",
-            "▖", "▌", "▞", "▛",
-            "▗", "▚", "▐", "▜",
-            "▄", "▙", "▟", "▉"
+            u8"?", u8"▘", u8"▝", u8"▀",
+            u8"▖", u8"▌", u8"▞", u8"▛",
+            u8"▗", u8"▚", u8"▐", u8"▜",
+            u8"▄", u8"▙", u8"▟", u8"▉"
             // clang-format on
          };
          unsigned index = 0;
@@ -401,14 +401,14 @@ print_reg(const RegisterFile& reg_file, PhysReg reg, bool has_adjacent_variable)
       } else {
          /* Indicate filled register slot */
          if (!has_adjacent_variable) {
-            printf("█");
+            printf(u8"█");
          } else {
             /* Use a slightly shorter box to leave a small gap between adjacent variables */
-            printf("▉");
+            printf(u8"▉");
          }
       }
    } else {
-      printf("·");
+      printf(u8"·");
    }
 }