diff --git a/src/std/dev/devI64inSoftCallback.c b/src/std/dev/devI64inSoftCallback.c
index baa05fdcc..9eb5656bb 100644
--- a/src/std/dev/devI64inSoftCallback.c
+++ b/src/std/dev/devI64inSoftCallback.c
@@ -41,7 +41,7 @@ typedef struct devPvt {
     struct {
         DBRstatus
         DBRtime
-        epicsInt32 value;
+        epicsInt64 value;
     } buffer;
 } devPvt;