diff --git a/include/FLAC++/decoder.h b/include/FLAC++/decoder.h
index df2964f6..d0bbfe99 100644
--- a/include/FLAC++/decoder.h
+++ b/include/FLAC++/decoder.h
@@ -95,7 +95,6 @@ namespace FLAC {
 				inline State(::FLAC__StreamDecoderState state): state_(state) { }
 				inline operator ::FLAC__StreamDecoderState() const { return state_; }
 				inline const char *as_cstring() const { return ::FLAC__StreamDecoderStateString[state_]; }
-				const char *resolved_as_cstring(const Stream &) const;
 			protected:
 				::FLAC__StreamDecoderState state_;
 			};
@@ -181,7 +180,7 @@ namespace FLAC {
 				inline State(::FLAC__SeekableStreamDecoderState state): state_(state) { }
 				inline operator ::FLAC__SeekableStreamDecoderState() const { return state_; }
 				inline const char *as_cstring() const { return ::FLAC__SeekableStreamDecoderStateString[state_]; }
-				const char *resolved_as_cstring(const SeekableStream &) const;
+				inline const char *resolved_as_cstring(const SeekableStream &decoder) const { return ::FLAC__seekable_stream_decoder_get_resolved_state_string(decoder.decoder_); }
 			protected:
 				::FLAC__SeekableStreamDecoderState state_;
 			};
@@ -276,7 +275,7 @@ namespace FLAC {
 				inline State(::FLAC__FileDecoderState state): state_(state) { }
 				inline operator ::FLAC__FileDecoderState() const { return state_; }
 				inline const char *as_cstring() const { return ::FLAC__FileDecoderStateString[state_]; }
-				const char *resolved_as_cstring(const File &) const;
+				inline const char *resolved_as_cstring(const File &decoder) const { return ::FLAC__file_decoder_get_resolved_state_string(decoder.decoder_); }
 			protected:
 				::FLAC__FileDecoderState state_;
 			};
diff --git a/include/FLAC++/encoder.h b/include/FLAC++/encoder.h
index 5818dfad..9142436f 100644
--- a/include/FLAC++/encoder.h
+++ b/include/FLAC++/encoder.h
@@ -96,7 +96,7 @@ namespace FLAC {
 				inline State(::FLAC__StreamEncoderState state): state_(state) { }
 				inline operator ::FLAC__StreamEncoderState() const { return state_; }
 				inline const char *as_cstring() const { return ::FLAC__StreamEncoderStateString[state_]; }
-				const char *resolved_as_cstring(const Stream &) const;
+				inline const char *resolved_as_cstring(const Stream &encoder) const { return ::FLAC__stream_encoder_get_resolved_state_string(encoder.encoder_); }
 			protected:
 				::FLAC__StreamEncoderState state_;
 			};
@@ -189,7 +189,7 @@ namespace FLAC {
 				inline State(::FLAC__SeekableStreamEncoderState state): state_(state) { }
 				inline operator ::FLAC__SeekableStreamEncoderState() const { return state_; }
 				inline const char *as_cstring() const { return ::FLAC__SeekableStreamEncoderStateString[state_]; }
-				const char *resolved_as_cstring(const SeekableStream &) const;
+				inline const char *resolved_as_cstring(const SeekableStream &encoder) const { return ::FLAC__seekable_stream_encoder_get_resolved_state_string(encoder.encoder_); }
 			protected:
 				::FLAC__SeekableStreamEncoderState state_;
 			};
@@ -283,7 +283,7 @@ namespace FLAC {
 				inline State(::FLAC__FileEncoderState state): state_(state) { }
 				inline operator ::FLAC__FileEncoderState() const { return state_; }
 				inline const char *as_cstring() const { return ::FLAC__FileEncoderStateString[state_]; }
-				const char *resolved_as_cstring(const File &) const;
+				inline const char *resolved_as_cstring(const File &encoder) const { return ::FLAC__file_encoder_get_resolved_state_string(encoder.encoder_); }
 			protected:
 				::FLAC__FileEncoderState state_;
 			};