diff --git a/src/common/psprintf.c b/src/common/psprintf.c
index b974a99be12..1254a9ed4dd 100644
--- a/src/common/psprintf.c
+++ b/src/common/psprintf.c
@@ -129,9 +129,9 @@ pvsnprintf(char *buf, size_t len, const char *fmt, va_list args)
 	if (nprinted < 0 && errno != 0 && errno != ENOMEM)
 	{
 #ifndef FRONTEND
-		elog(ERROR, "vsnprintf failed: %m");
+		elog(ERROR, "vsnprintf failed: %m with format string \"%s\"", fmt);
 #else
-		fprintf(stderr, "vsnprintf failed: %s\n", strerror(errno));
+		fprintf(stderr, "vsnprintf failed: %m with format string \"%s\"\n", fmt);
 		exit(EXIT_FAILURE);
 #endif
 	}