diff --git a/mypy/checkstrformat.py b/mypy/checkstrformat.py
index 45075bd37552..4cbbc86d1236 100644
--- a/mypy/checkstrformat.py
+++ b/mypy/checkstrformat.py
@@ -20,6 +20,7 @@
 import mypy.errorcodes as codes
 from mypy import message_registry
 from mypy.checker_shared import TypeCheckerSharedApi
+from mypy.constant_fold import constant_fold_expr
 from mypy.errors import Errors
 from mypy.maptype import map_instance_to_supertype
 from mypy.messages import MessageBuilder
@@ -1005,8 +1006,12 @@ def check_expr(expr: Expression) -> None:
                     and len(expr.value) != 1
                 ):
                     self.msg.requires_int_or_single_byte(context)
-                elif isinstance(expr, (StrExpr, BytesExpr)) and len(expr.value) != 1:
-                    self.msg.requires_int_or_char(context)
+                elif isinstance(folded := constant_fold_expr(expr, "<unused>"), str):
+                    if len(folded) != 1:
+                        self.msg.requires_int_or_char(context)
+                elif isinstance(expr, BytesExpr):
+                    if len(expr.value) != 1:
+                        self.msg.requires_int_or_char(context)
 
         return check_expr, check_type
 
diff --git a/test-data/unit/check-formatting.test b/test-data/unit/check-formatting.test
index b5b37f8d2976..374f0dcc1a52 100644
--- a/test-data/unit/check-formatting.test
+++ b/test-data/unit/check-formatting.test
@@ -103,14 +103,27 @@ a = None # type: Any
 [typing fixtures/typing-medium.pyi]
 
 [case testStringInterpolationC]
+from typing import Final
+
+final_int: Final = 1
+final_float: Final = 1.0
+final_char_string: Final = 's'
+final_empty_string: Final = ''
+final_string: Final = 'ab'
+
 '%c' % 1
-'%c' % 1.0   # E: "%c" requires int or char (expression has type "float")
+'%c' % final_int
+'%c' % 1.0                 # E: "%c" requires int or char (expression has type "float")
+'%c' % final_float         # E: "%c" requires int or char (expression has type "float")
 '%c' % 's'
-'%c' % ''    # E: "%c" requires int or char
-'%c' % 'ab'  # E: "%c" requires int or char
-'%c' % b'a'  # E: "%c" requires int or char (expression has type "bytes")
-'%c' % b''   # E: "%c" requires int or char (expression has type "bytes")
-'%c' % b'ab' # E: "%c" requires int or char (expression has type "bytes")
+'%c' % final_char_string
+'%c' % ''                  # E: "%c" requires int or char
+'%c' % final_empty_string  # E: "%c" requires int or char
+'%c' % 'ab'                # E: "%c" requires int or char
+'%c' % final_string        # E: "%c" requires int or char
+'%c' % b'a'                # E: "%c" requires int or char (expression has type "bytes")
+'%c' % b''                 # E: "%c" requires int or char (expression has type "bytes")
+'%c' % b'ab'               # E: "%c" requires int or char (expression has type "bytes")
 [builtins fixtures/primitives.pyi]
 
 [case testStringInterpolationMappingTypes]