diff --git a/src/C/H5.c b/src/C/H5.c
index 629517d..eee8ae6 100644
--- a/src/C/H5.c
+++ b/src/C/H5.c
@@ -135,7 +135,7 @@ H5GetStepNameFormat (
 	) {
 	H5_API_ENTER4 (h5_err_t,
 		       "f=0x%p, name=0x%p, l_name=%llu, width=0x%p",
-		       f, name, l_name, width);
+		       f, name, (unsigned long long)l_name, width);
 	H5_API_RETURN (h5_get_stepname_fmt (f, name, l_name, width));
 }
 
@@ -151,7 +151,7 @@ H5SetStep (
 	h5_file_t* const f,		/*!< [in]  Handle to open file */
 	const h5_id_t step		/*!< [in]  Step to set. */
 	) {
-	H5_API_ENTER2 (h5_err_t, "f=0x%p, step=%lld", f, step);
+	H5_API_ENTER2 (h5_err_t, "f=0x%p, step=%lld", f, (long long)step);
 	H5_API_RETURN (h5_set_step (f, step));
 }
 
diff --git a/src/C/H5Part.c b/src/C/H5Part.c
index 29c842b..1dc3d80 100644
--- a/src/C/H5Part.c
+++ b/src/C/H5Part.c
@@ -391,8 +391,8 @@ H5PartGetDatasetName (
 		       "idx=%lld, "
 		       "name=\"%s\", len=%llu, ",
 		       f,
-		       idx,
-		       name, len);
+		       (long long)idx,
+		       name, (unsigned long long)len);
 	H5_API_RETURN (h5u_get_dataset_info(f, idx, name, len, NULL, NULL));
 }
 
diff --git a/src/C/H5_attribs.c b/src/C/H5_attribs.c
index 8b4fed5..8050bc5 100644
--- a/src/C/H5_attribs.c
+++ b/src/C/H5_attribs.c
@@ -730,9 +730,9 @@ H5GetStepAttribInfo (
 		       "attrib_idx=%llu, attrib_name=%p, len_attrib_name=%llu, "
 		       "attrib_type=%p, attrib_nelem=%p",
 		       f,
-		       attrib_idx,
+		       (unsigned long long)attrib_idx,
 		       attrib_name,
-		       len_of_attrib_name,
+		       (unsigned long long)len_of_attrib_name,
 		       attrib_type,
 		       attrib_nelem);
 	H5_API_RETURN (h5_get_attrib_info (
diff --git a/src/h5core/h5u_model.c b/src/h5core/h5u_model.c
index 6e4157e..7f9c92b 100644
--- a/src/h5core/h5u_model.c
+++ b/src/h5core/h5u_model.c
@@ -322,7 +322,7 @@ h5u_set_view_indices (
 	TRY (hdf5_select_elements_of_dataspace ( 
 		u->diskshape,
 		H5S_SELECT_SET,
-		nelems, indices ) );
+		(hsize_t)nelems, (hsize_t*)indices ) );
 
 	u->viewindexed = 1;