diff --git a/src/bloaty.h b/src/bloaty.h
index e202d8a..856b61d 100644
--- a/src/bloaty.h
+++ b/src/bloaty.h
@@ -467,7 +467,10 @@
           PrettyPrint(options.max_label_len, out);
           break;
         case bloaty::OutputFormat::kCSV:
-          PrintToCSV(out);
+          PrintToCSV(out, /*tabs=*/false);
+          break;
+        case bloaty::OutputFormat::kTSV:
+          PrintToCSV(out, /*tabs=*/true);
           break;
         case bloaty::OutputFormat::kTSV:
           PrintToCSV(out, /*tabs=*/true);
@@ -504,7 +507,7 @@
   bool diff_mode_ = false;
 
   void PrettyPrint(size_t max_label_len, std::ostream* out) const;
-  void PrintToCSV(std::ostream* out, bool tabs=false) const;
+  void PrintToCSV(std::ostream* out, bool tabs) const;
   size_t CalculateLongestLabel(const RollupRow& row, int indent) const;
   void PrettyPrintRow(const RollupRow& row, size_t indent, size_t longest_row,
                       std::ostream* out) const;
@@ -512,10 +515,10 @@
                        std::ostream* out) const;
   void PrintRowToCSV(const RollupRow& row,
                      std::vector<std::string> parent_labels,
-                     std::ostream* out, bool tabs=false) const;
+                     std::ostream* out, bool tabs) const;
   void PrintTreeToCSV(const RollupRow& row,
                       std::vector<std::string> parent_labels,
-                      std::ostream* out, bool tabs=false) const;
+                      std::ostream* out, bool tabs) const;
 };
 
 bool ParseOptions(bool skip_unknown, int* argc, char** argv[], Options* options,