diff --git a/ChangeLog b/ChangeLog
index 0ab26776b..a102c08b2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-08-15  Robert Larice
+ * src/maths/sparse/spdefs.h :
+    fix txfree() prototype
+
 2010-08-13  Holger Vogt
  * autogen.sh: keep configure.in untouched by generating temporary 
    configure.ac if --adms is selected
diff --git a/src/maths/sparse/spdefs.h b/src/maths/sparse/spdefs.h
index 567112066..bb521abf1 100644
--- a/src/maths/sparse/spdefs.h
+++ b/src/maths/sparse/spdefs.h
@@ -369,7 +369,7 @@ typedef  struct
 /* Allocation */
 
 extern void * tmalloc(size_t);
-extern void * txfree(void *);
+extern void   txfree(void *);
 extern void * trealloc(void *, size_t);
 
 #define ALLOC(type,number)  ((type *)tmalloc((size_t)(sizeof(type)*(number))))