diff --git a/liblog/fake_log_device.c b/liblog/fake_log_device.c
index ed9d699ac..f8b725412 100644
--- a/liblog/fake_log_device.c
+++ b/liblog/fake_log_device.c
@@ -454,7 +454,7 @@ static void showLog(LogState *state,
 
     numVecs = numLines*3;  // 3 iovecs per line.
     if (numVecs > INLINE_VECS) {
-        vec = (struct iovec*)malloc(sizeof(struct iovec)*numLines);
+        vec = (struct iovec*)malloc(sizeof(struct iovec)*numVecs);
         if (vec == NULL) {
             msg = "LOG: write failed, no memory";
             numVecs = 3;