diff --git a/db/db_impl.cc b/db/db_impl.cc
index c22276675..d95481079 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -1717,7 +1717,14 @@ Status DBImpl::DoCompactionWork(CompactionState* compact) {
 
   stats.files_in_leveln = compact->compaction->num_input_files(0);
   stats.files_in_levelnp1 = compact->compaction->num_input_files(1);
-  stats.files_out_levelnp1 = compact->outputs.size();
+
+  int num_output_files = compact->outputs.size();
+  if (compact->builder != NULL) {
+    // An error occured so ignore the last output.
+    assert(num_output_files > 0);
+    --num_output_files;
+  }
+  stats.files_out_levelnp1 = num_output_files;
 
   for (int i = 0; i < compact->compaction->num_input_files(0); i++)
     stats.bytes_readn += compact->compaction->input(0, i)->file_size;
@@ -1725,7 +1732,7 @@ Status DBImpl::DoCompactionWork(CompactionState* compact) {
   for (int i = 0; i < compact->compaction->num_input_files(1); i++)
     stats.bytes_readnp1 += compact->compaction->input(1, i)->file_size;
 
-  for (size_t i = 0; i < compact->outputs.size(); i++) {
+  for (int i = 0; i < num_output_files; i++) {
     stats.bytes_written += compact->outputs[i].file_size;
   }
 
diff --git a/tools/db_stress.cc b/tools/db_stress.cc
index 69c578079..02934c85e 100644
--- a/tools/db_stress.cc
+++ b/tools/db_stress.cc
@@ -678,19 +678,19 @@ class StressTest {
     fprintf(stdout, "Num keys per lock   : %d\n",
             1 << FLAGS_log2_keys_per_lock);
 
-    char* compression = (char *)std::string("").c_str();
+    const char* compression = "";
     switch (FLAGS_compression_type) {
       case leveldb::kNoCompression:
-        compression = (char *)std::string("none").c_str();
+        compression = "none";
         break;
       case leveldb::kSnappyCompression:
-        compression = (char *)std::string("snappy").c_str();
+        compression = "snappy";
         break;
       case leveldb::kZlibCompression:
-        compression = (char *)std::string("zlib").c_str();
+        compression = "zlib";
         break;
       case leveldb::kBZip2Compression:
-        compression = (char *)std::string("bzip2").c_str();
+        compression = "bzip2";
         break;
     }