diff --git a/libfreedv/mpdecode_core.cpp b/libfreedv/mpdecode_core.cpp
index 50d0d0277..da8c0badc 100644
--- a/libfreedv/mpdecode_core.cpp
+++ b/libfreedv/mpdecode_core.cpp
@@ -135,7 +135,7 @@ static float max_star0(
                        float delta1,
                        float delta2 )
 {
-    register float diff;
+    float diff;
 
     diff = delta2 - delta1;