diff --git a/XYPlotParam.H b/XYPlotParam.H
index 5cf1811..434aec9 100644
--- a/XYPlotParam.H
+++ b/XYPlotParam.H
@@ -198,7 +198,7 @@ private:
   //
   // Look up item in table -- return zero if not found
   //
-  param_full * st_lookup(register char *key);
+  param_full * st_lookup(char *key);
 
   //
   // Insert an item into the table - replacing if it already exists
@@ -215,10 +215,10 @@ private:
   //
   void rehash(void);
 
-  int strihash(register char *xypstring) {
-    register int val = 0;
-    register int c;
-    register int i = 0;
+  int strihash(char *xypstring) {
+    int val = 0;
+    int c;
+    int i = 0;
     
     while ((c = *xypstring++) != '\0') {
       if(isupper(c)) {
diff --git a/XYPlotParam.cpp b/XYPlotParam.cpp
index a797d40..fb7cd76 100644
--- a/XYPlotParam.cpp
+++ b/XYPlotParam.cpp
@@ -510,8 +510,8 @@ void XYPlotParameters::WriteToFile(char *filename) {
 //
 //
 // -------------------------------------------------------------------
-param_full *XYPlotParameters::st_lookup(register char *key) {
-  register st_table_entry *ptr;
+param_full *XYPlotParameters::st_lookup(char *key) {
+  st_table_entry *ptr;
   
   // find entry.
   ptr = param_table.bins[strihash(key)];
@@ -532,7 +532,7 @@ param_full *XYPlotParameters::st_lookup(register char *key) {
 int XYPlotParameters::st_insert(char *key, param_full *value) {
   int hash_val;
   st_table_entry *newentry;
-  register st_table_entry *ptr, **last;
+  st_table_entry *ptr, **last;
   
   hash_val = strihash(key);