2 files changed, 2 insertions, 2 deletions
diff --git a/src/IO.cc b/src/IO.cc
index a6c8eab..0287a9d 100644
--- a/src/IO.cc
+++ b/src/IO.cc
@@ -302,7 +302,7 @@ int IOnAnnotations(IOFile deviceID){
   return dev->nAnnotations();
 }
 
-int IOwriteAttribute(IOFile deviceID,char *name,int type,Long length,void *data){
+int IOwriteAttribute(IOFile deviceID,char *name,int type,Long length,const void *data){
   IObase *dev=(IObase*)(deviceID);
   IObase::DataType typeID = IObase::Int2DataType(type);
   return dev->writeAttribute(name,typeID,length,data);
diff --git a/src/IOProtos.h b/src/IOProtos.h
index 9d310b7..abbf36b 100644
--- a/src/IOProtos.h
+++ b/src/IOProtos.h
@@ -52,7 +52,7 @@ int IOreadAnnotation PROTO((IOFile deviceID,int idx,char *annotation,int maxsize
 int IOreadAnnotationInfo PROTO((IOFile deviceID,int idx,int *size));
 int IOnAnnotations PROTO((IOFile deviceID));
 
-int IOwriteAttribute PROTO((IOFile deviceID,char *name,int type,Long length,void *data));
+int IOwriteAttribute PROTO((IOFile deviceID,char *name,int type,Long length,const void *data));
 int IOreadIndexedAttributeInfo PROTO((IOFile deviceID,int number,
 				      char *name,int *type,Long *nelem,int maxnamelen));
 int IOreadAttributeInfo PROTO((IOFile deviceID,char *name,int *type,Long *nelem));