diff --git a/include/BeeThree.h b/include/BeeThree.h
index 4c11cdb..203855a 100644
--- a/include/BeeThree.h
+++ b/include/BeeThree.h
@@ -73,7 +73,7 @@ class BeeThree : public FM
 
 inline StkFloat BeeThree :: tick( unsigned int )
 {
-  register StkFloat temp;
+  StkFloat temp;
 
   if ( modDepth_ > 0.0 )	{
     temp = 1.0 + ( modDepth_ * vibrato_.tick() * 0.1 );
diff --git a/include/FMVoices.h b/include/FMVoices.h
index 5c49b74..0567668 100644
--- a/include/FMVoices.h
+++ b/include/FMVoices.h
@@ -80,7 +80,7 @@ class FMVoices : public FM
 
 inline StkFloat FMVoices :: tick( unsigned int )
 {
-  register StkFloat temp, temp2;
+  StkFloat temp, temp2;
 
   temp = gains_[3] * adsr_[3]->tick() * waves_[3]->tick();
   temp2 = vibrato_.tick() * modDepth_ * 0.1;
diff --git a/include/HevyMetl.h b/include/HevyMetl.h
index 681e257..6827bb6 100644
--- a/include/HevyMetl.h
+++ b/include/HevyMetl.h
@@ -69,7 +69,7 @@ class HevyMetl : public FM
 
 inline StkFloat HevyMetl :: tick( unsigned int )
 {
-  register StkFloat temp;
+  StkFloat temp;
 
   temp = vibrato_.tick() * modDepth_ * 0.2;    
   waves_[0]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[0]);
diff --git a/include/PercFlut.h b/include/PercFlut.h
index b0f9435..ccdd8a1 100644
--- a/include/PercFlut.h
+++ b/include/PercFlut.h
@@ -70,7 +70,7 @@ class PercFlut : public FM
 
 inline StkFloat PercFlut :: tick( unsigned int )
 {
-  register StkFloat temp;
+  StkFloat temp;
 
   temp = vibrato_.tick() * modDepth_ * 0.2;    
   waves_[0]->setFrequency(baseFrequency_ * (1.0 + temp) * ratios_[0]);
diff --git a/src/Delay.cpp b/src/Delay.cpp
index b48a152..aec1683 100644
--- a/src/Delay.cpp
+++ b/src/Delay.cpp
@@ -61,19 +61,19 @@ void Delay :: setDelay( unsigned long delay )
 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/src/Stk.cpp b/src/Stk.cpp
index 8f8e106..891faee 100644
--- a/src/Stk.cpp
+++ b/src/Stk.cpp
@@ -125,7 +125,7 @@ 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);
@@ -135,7 +135,7 @@ 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);
@@ -151,7 +151,7 @@ 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);