diff --git a/agg/agg_basics.h b/agg/agg_basics.h
index cb95838..7ed2a20 100644
--- a/agg/agg_basics.h
+++ b/agg/agg_basics.h
@@ -203,7 +203,7 @@ namespace agg
     {
         AGG_INLINE static unsigned mul(unsigned a, unsigned b)
         {
-            register unsigned q = a * b + (1 << (Shift-1));
+            unsigned q = a * b + (1 << (Shift-1));
             return (q + (q >> Shift)) >> Shift;
         }
     };
diff --git a/agg/agg_trans_affine.h b/agg/agg_trans_affine.h
index cbed7c8..1dda79b 100644
--- a/agg/agg_trans_affine.h
+++ b/agg/agg_trans_affine.h
@@ -292,7 +292,7 @@ namespace agg
     //------------------------------------------------------------------------
     inline void trans_affine::transform(double* x, double* y) const
     {
-        register double tmp = *x;
+        double tmp = *x;
         *x = tmp * sx  + *y * shx + tx;
         *y = tmp * shy + *y * sy  + ty;
     }
@@ -300,7 +300,7 @@ namespace agg
     //------------------------------------------------------------------------
     inline void trans_affine::transform_2x2(double* x, double* y) const
     {
-        register double tmp = *x;
+        double tmp = *x;
         *x = tmp * sx  + *y * shx;
         *y = tmp * shy + *y * sy;
     }
@@ -308,9 +308,9 @@ namespace agg
     //------------------------------------------------------------------------
     inline void trans_affine::inverse_transform(double* x, double* y) const
     {
-        register double d = determinant_reciprocal();
-        register double a = (*x - tx) * d;
-        register double b = (*y - ty) * d;
+        double d = determinant_reciprocal();
+        double a = (*x - tx) * d;
+        double b = (*y - ty) * d;
         *x = a * sy - b * shx;
         *y = b * sx - a * shy;
     }