diff --git a/strace.c b/strace.c
index f1f634ba..64e90e71 100644
--- a/strace.c
+++ b/strace.c
@@ -222,14 +222,34 @@ static void die(void)
 
 static void verror_msg(int err_no, const char *fmt, va_list p)
 {
+	char *msg;
+
 	fflush(NULL);
-	fprintf(stderr, "%s: ", progname);
-	vfprintf(stderr, fmt, p);
-	if (err_no)
-		fprintf(stderr, ": %s\n", strerror(err_no));
-	else
-		putc('\n', stderr);
-	fflush(stderr);
+
+	/* We want to print entire message with single fprintf to ensure
+	 * message integrity if stderr is shared with other programs.
+	 * Thus we use vasprintf + single fprintf.
+	 */
+	msg = NULL;
+	vasprintf(&msg, fmt, p);
+	if (msg) {
+		if (err_no)
+			fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(err_no));
+		else
+			fprintf(stderr, "%s: %s\n", progname, msg);
+		free(msg);
+	} else {
+		/* malloc in vasprintf failed, try it without malloc */
+		fprintf(stderr, "%s: ", progname);
+		vfprintf(stderr, fmt, p);
+		if (err_no)
+			fprintf(stderr, ": %s\n", strerror(err_no));
+		else
+			putc('\n', stderr);
+	}
+	/* We don't switch stderr to buffered, thus fprintf(stderr)
+	 * always flushes its output and this is not necessary: */
+	/* fflush(stderr); */
 }
 
 void error_msg(const char *fmt, ...)