1 files changed, 1 insertions, 1 deletions
diff --git a/src/H5TB.c b/src/H5TB.c
index 4a63462..73892c5 100644
--- a/src/H5TB.c
+++ b/src/H5TB.c
@@ -65,7 +65,7 @@
 #include "H5TBprivate.h"    /*Threaded, balanced, binary trees	  */
 
 # define   KEYcmp(k1,k2,a) ((NULL!=compar) ? (*compar)( k1, k2, a) \
-                 : HDmemcmp( k1, k2, 0<(a) ? (a) : HDstrlen(k1) )  )
+                 : HDmemcmp( k1, k2, 0<(a) ? ((size_t)a) : HDstrlen(k1) )  )
 
 /* Return maximum of two scalar values (use arguments w/o side effects): */
 #define   Max(a,b)  ( (a) > (b) ? (a) : (b) )