diff --git a/common.cpp b/common.cpp
index e5dcf05..55b3cf2 100644
--- a/common.cpp
+++ b/common.cpp
@@ -567,9 +567,9 @@ void setnonblocking(int sock) {
     Generic checksum calculation function
 */
 unsigned short csum(const unsigned short *ptr,int nbytes) {//works both for big and little endian
-    register long sum;
+    long sum;
     unsigned short oddbyte;
-    register short answer;
+    short answer;
 
     sum=0;
     while(nbytes>1) {