diff --git a/src/MantissaExponentConverter.cc b/src/MantissaExponentConverter.cc
index 060efb6..fe1198e 100644
--- a/src/MantissaExponentConverter.cc
+++ b/src/MantissaExponentConverter.cc
@@ -44,8 +44,8 @@ class MantissaExponentConverter : public StreamFormatConverter
 };
 
 int MantissaExponentConverter::
-parse(const StreamFormat& fmt, StreamBuffer& info,
-    const char*& source, bool scanFormat)
+parse(const StreamFormat&, StreamBuffer&,
+    const char*&, bool)
 {
     return double_format;
 }
diff --git a/src/TimestampConverter.cc b/src/TimestampConverter.cc
index ca648c4..a5fda17 100644
--- a/src/TimestampConverter.cc
+++ b/src/TimestampConverter.cc
@@ -53,8 +53,8 @@ class TimestampConverter : public StreamFormatConverter
 };
 
 int TimestampConverter::
-parse(const StreamFormat& fmt, StreamBuffer& info,
-    const char*& source, bool scanFormat)
+parse(const StreamFormat&, StreamBuffer& info,
+    const char*& source, bool)
 {
     unsigned int n;
     char* c;