diff --git a/src/defines.h b/src/defines.h
index dfba32c0..a906f99d 100644
--- a/src/defines.h
+++ b/src/defines.h
@@ -86,7 +86,7 @@
 #define MAX_CALLSIGN         80
 
 // Real-time memory block size
-#define CODEC2_REAL_TIME_MEMORY_SIZE (256*1024)
+#define CODEC2_REAL_TIME_MEMORY_SIZE (512*1024)
    
 enum
 {