diff --git a/src/backtrace.c b/src/backtrace.c
index b9e1bbfa..d7465dfa 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -114,7 +114,7 @@ void __iwd_backtrace_print(unsigned int offset)
 		if (written < 0)
 			break;
 
-		len = read(infd[0], buf, sizeof(buf));
+		len = read(infd[0], buf, sizeof(buf) - 1);
 		if (len < 0)
 			break;