diff --git a/lib-src/libnyquist/nyquist/nyqstk/src/Delay.cpp b/lib-src/libnyquist/nyquist/nyqstk/src/Delay.cpp
index 1b5a0e097..34729212c 100644
--- a/lib-src/libnyquist/nyquist/nyqstk/src/Delay.cpp
+++ b/lib-src/libnyquist/nyquist/nyqstk/src/Delay.cpp
@@ -119,19 +119,19 @@ unsigned long Delay :: getDelay(void) const
 StkFloat Delay :: energy(void) const
 {
   unsigned long i;
-  register StkFloat e = 0;
+  StkFloat e = 0;
   if (inPoint_ >= outPoint_) {
     for (i=outPoint_; i<inPoint_; i++) {
-      register StkFloat t = inputs_[i];
+      StkFloat t = inputs_[i];
       e += t*t;
     }
   } else {
     for (i=outPoint_; i<inputs_.size(); i++) {
-      register StkFloat t = inputs_[i];
+      StkFloat t = inputs_[i];
       e += t*t;
     }
     for (i=0; i<inPoint_; i++) {
-      register StkFloat t = inputs_[i];
+      StkFloat t = inputs_[i];
       e += t*t;
     }
   }
diff --git a/lib-src/libnyquist/nyquist/nyqstk/src/Stk.cpp b/lib-src/libnyquist/nyquist/nyqstk/src/Stk.cpp
index 6040237f1..7e21bfae9 100644
--- a/lib-src/libnyquist/nyquist/nyqstk/src/Stk.cpp
+++ b/lib-src/libnyquist/nyquist/nyqstk/src/Stk.cpp
@@ -48,7 +48,7 @@ void Stk :: setRawwavePath( std::string path )
 
 void Stk :: swap16(unsigned char *ptr)
 {
-  register unsigned char val;
+  unsigned char val;
 
   // Swap 1st and 2nd bytes
   val = *(ptr);
@@ -58,7 +58,7 @@ void Stk :: swap16(unsigned char *ptr)
 
 void Stk :: swap32(unsigned char *ptr)
 {
-  register unsigned char val;
+  unsigned char val;
 
   // Swap 1st and 4th bytes
   val = *(ptr);
@@ -74,7 +74,7 @@ void Stk :: swap32(unsigned char *ptr)
 
 void Stk :: swap64(unsigned char *ptr)
 {
-  register unsigned char val;
+  unsigned char val;
 
   // Swap 1st and 8th bytes
   val = *(ptr);