diff --git a/src/add-ons/media/plugins/aiff_reader/aiff_reader.cpp b/src/add-ons/media/plugins/aiff_reader/aiff_reader.cpp
index 310afcd0a7..3e2dc5836f 100644
--- a/src/add-ons/media/plugins/aiff_reader/aiff_reader.cpp
+++ b/src/add-ons/media/plugins/aiff_reader/aiff_reader.cpp
@@ -405,15 +405,15 @@ aiffReader::GetNextChunk(void *cookie,
 }
 
 uint32
-aiffReader::DecodeFrameRate(void *_80bit_float)
+aiffReader::DecodeFrameRate(const void *_80bit_float)
 {
 	// algorithm from http://www.borg.com/~jglatt/tech/aiff.htm
 	uint32 mantissa;
 	uint32 last;
 	uint32 exp;
-	
-	mantissa = (uint32)B_BENDIAN_TO_HOST_INT32(*(uint32 *)((char *)_80bit_float + 2));
-	exp = 30 - *(uint8 *)((char *)_80bit_float + 1);
+
+	mantissa = (uint32)B_BENDIAN_TO_HOST_INT32(*(const uint32 *)((const char *)_80bit_float + 2));
+	exp = 30 - *(const uint8 *)((const char *)_80bit_float + 1);
 	if (exp > 32)
 		return 0;
 	last = 0;
diff --git a/src/add-ons/media/plugins/aiff_reader/aiff_reader.h b/src/add-ons/media/plugins/aiff_reader/aiff_reader.h
index 6f1aeae565..097c270e1d 100644
--- a/src/add-ons/media/plugins/aiff_reader/aiff_reader.h
+++ b/src/add-ons/media/plugins/aiff_reader/aiff_reader.h
@@ -33,16 +33,16 @@ class aiffReader : public Reader
 public:
 				aiffReader();
 				~aiffReader();
-	
+
 	const char *Copyright();
-	
+
 	status_t	Sniff(int32 *streamCount);
 
 	void		GetFileFormatInfo(media_file_format *mff);
 
 	status_t	AllocateCookie(int32 streamNumber, void **cookie);
 	status_t	FreeCookie(void *cookie);
-	
+
 	status_t	GetStreamInfo(void *cookie, int64 *frameCount, bigtime_t *duration,
 							  media_format *format, const void **infoBuffer, size_t *infoSize);
 
@@ -54,20 +54,20 @@ public:
 							 const void **chunkBuffer, size_t *chunkSize,
 							 media_header *mediaHeader);
 private:
-	uint32		DecodeFrameRate(void *_80bit_float);
-									 
+	uint32		DecodeFrameRate(const void *_80bit_float);
+
 	BPositionIO *Source() { return fSource; }
-	
+
 private:
 	BPositionIO *	fSource;
-	
+
 	media_format	fFormat;
 	int64			fDataStart;
 	int64			fDataSize;
 
 	int64			fFrameCount;
 	bigtime_t		fDuration;
-	
+
 	bool			fRaw;
 
 	int64			fPosition;