diff --git a/csv_util.h b/csv_util.h
index 57789407e..149b4ff00 100644
--- a/csv_util.h
+++ b/csv_util.h
@@ -43,13 +43,13 @@ enum class CsvQuoteMethod {historic, rfc4180};
 
 QStringList
 csv_linesplit(const QString& string, const QString& delimited_by,
-              const QString& enclosed_in, const int line_no, CsvQuoteMethod method = CsvQuoteMethod::historic);
+              const QString& enclosed_in, int line_no, CsvQuoteMethod method = CsvQuoteMethod::historic);
 
 int
-dec_to_intdeg(const double d);
+dec_to_intdeg(double d);
 
 double
-intdeg_to_dec(const int ideg);
+intdeg_to_dec(int ideg);
 
 double
 decdir_to_dec(const char* decdir);
diff --git a/nmea.h b/nmea.h
index df91ca921..61f5c0b38 100644
--- a/nmea.h
+++ b/nmea.h
@@ -82,7 +82,7 @@ class NmeaFormat : public Format
   void wr_position(Waypoint* wpt) override;
   void wr_position_deinit() override;
 
-  static int nmea_cksum(const char* const buf);
+  static int nmea_cksum(const char* buf);
 
 private:
   /* Types */