diff --git a/src/log.c b/src/log.c
index 8047084c..b3bcbc2c 100644
--- a/src/log.c
+++ b/src/log.c
@@ -185,7 +185,7 @@ static void print_backtrace(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;