diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 66b8aa14b92..d952a53cf3c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -39,6 +39,8 @@ repos:
         exclude: Lib/test/tokenizedata/coding20731.py
       - id: trailing-whitespace
         types_or: [c, inc, python, rst]
+      - id: trailing-whitespace
+        files: '\.(gram)$'
 
   - repo: https://github.com/woodruffw/zizmor-pre-commit
     rev: v1.6.0
diff --git a/Grammar/python.gram b/Grammar/python.gram
index 243d9cdd82b..cc2b58b0fcf 100644
--- a/Grammar/python.gram
+++ b/Grammar/python.gram
@@ -79,7 +79,7 @@ _PyPegen_parse(Parser *p)
 # ~
 #   Commit to the current alternative, even if it fails to parse.
 # &&e
-#   Eager parse e. The parser will not backtrack and will immediately 
+#   Eager parse e. The parser will not backtrack and will immediately
 #   fail with SyntaxError if e cannot be parsed.
 #
 
@@ -640,7 +640,7 @@ type_alias[stmt_ty]:
 # Type parameter declaration
 # --------------------------
 
-type_params[asdl_type_param_seq*]: 
+type_params[asdl_type_param_seq*]:
     | invalid_type_params
     | '[' t=type_param_seq ']' {
         CHECK_VERSION(asdl_type_param_seq *, 12, "Type parameter lists are", t) }
@@ -1307,13 +1307,13 @@ invalid_group:
 invalid_import:
     | a='import' ','.dotted_name+ 'from' dotted_name {
         RAISE_SYNTAX_ERROR_STARTING_FROM(a, "Did you mean to use 'from ... import ...' instead?") }
-    | 'import' token=NEWLINE { 
+    | 'import' token=NEWLINE {
         RAISE_SYNTAX_ERROR_STARTING_FROM(token, "Expected one or more names after 'import'") }
 
 invalid_import_from_targets:
     | import_from_as_names ',' NEWLINE {
         RAISE_SYNTAX_ERROR("trailing comma not allowed without surrounding parentheses") }
-    | token=NEWLINE { 
+    | token=NEWLINE {
         RAISE_SYNTAX_ERROR_STARTING_FROM(token, "Expected one or more names after 'import'") }
 
 invalid_with_stmt:
@@ -1437,5 +1437,5 @@ invalid_factor:
 invalid_type_params:
     | '[' token=']' {
         RAISE_SYNTAX_ERROR_STARTING_FROM(
-            token, 
+            token,
             "Type parameter list cannot be empty")}