2 files changed, 7 insertions, 2 deletions
diff --git a/Misc/NEWS b/Misc/NEWS
index 819a401..ec857ac 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -44,6 +44,11 @@ Library
 Extension Modules
 -----------------
 
+- Issue #9277: Fix bug in struct.pack for bools in standard mode
+  (e.g., struct.pack('>?')):  if conversion to bool raised an exception
+  then that exception wasn't properly propagated on machines where
+  char is unsigned.
+
 Build
 -----
 
diff --git a/Modules/_struct.c b/Modules/_struct.c
index 52c5eeb..f22c31c 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -912,11 +912,11 @@ bp_double(char *p, PyObject *v, const formatdef *f)
 static int
 bp_bool(char *p, PyObject *v, const formatdef *f)
 {
-    char y;
+    int y;
     y = PyObject_IsTrue(v);
     if (y < 0)
         return -1;
-    memcpy(p, (char *)&y, sizeof y);
+    *p = (char)y;
     return 0;
 }