diff --git a/ext2spice/ext2hier.c b/ext2spice/ext2hier.c
index 46f49bb4..4e381ea5 100644
--- a/ext2spice/ext2hier.c
+++ b/ext2spice/ext2hier.c
@@ -1388,7 +1388,7 @@ spcsubHierVisit(
     char **resstrptr)
 {
     HierName *hierName;
-    char *nsn;
+    const char *nsn;
 
     if (node->efnode_flags & EF_GLOB_SUBS_NODE)
     {
diff --git a/ext2spice/ext2spice.c b/ext2spice/ext2spice.c
index d2a43c38..7cf9ae37 100644
--- a/ext2spice/ext2spice.c
+++ b/ext2spice/ext2spice.c
@@ -3726,7 +3726,7 @@ spcsubVisit(
 {
     char **resstr = (char **)CD2PTR(cdata);
     HierName *hierName;
-    char *nsn;
+    const char *nsn;
 
     if (node->efnode_flags & EF_GLOB_SUBS_NODE)
     {
@@ -3767,7 +3767,7 @@ spcnodeVisit(
     HierName *hierName;
     bool isConnected = FALSE;
     const char *fmt;
-    char *nsn;
+    const char *nsn;
     EFAttr *ap;
 
     if (node->efnode_client)
@@ -3831,7 +3831,7 @@ nodeVisitDebug(
 {
     EFNodeName *nn;
     HierName *hierName;
-    char *nsn;
+    const char *nsn;
     EFAttr *ap;
 
     hierName = (HierName *) node->efnode_name->efnn_hier;