diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index 13aaba405e3204..b09e524a756ca8 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -382,6 +382,13 @@
Traceback (most recent call last):
SyntaxError: invalid syntax
+# But prefixes of soft keywords should
+# still raise specialized errors
+
+>>> (mat x)
+Traceback (most recent call last):
+SyntaxError: invalid syntax. Perhaps you forgot a comma?
+
From compiler_complex_args():
>>> def f(None=1):
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-06-09-23-57-37.gh-issue-130077.MHknDB.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-06-09-23-57-37.gh-issue-130077.MHknDB.rst
new file mode 100644
index 00000000000000..a7d02426b6fc13
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-06-09-23-57-37.gh-issue-130077.MHknDB.rst
@@ -0,0 +1,2 @@
+Properly raise custom syntax errors when incorrect syntax containing names
+that are prefixes of soft keywords is encountered. Patch by Pablo Galindo.
diff --git a/Parser/pegen.c b/Parser/pegen.c
index 81aad47010181c..fe29b1d4267584 100644
--- a/Parser/pegen.c
+++ b/Parser/pegen.c
@@ -620,7 +620,8 @@ expr_ty _PyPegen_soft_keyword_token(Parser *p) {
Py_ssize_t size;
PyBytes_AsStringAndSize(t->bytes, &the_token, &size);
for (char **keyword = p->soft_keywords; *keyword != NULL; keyword++) {
- if (strncmp(*keyword, the_token, (size_t)size) == 0) {
+ if (strlen(*keyword) == (size_t)size &&
+ strncmp(*keyword, the_token, (size_t)size) == 0) {
return _PyPegen_name_from_token(p, t);
}
}
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