diff --git a/Contrib/nsDialogs/nsDialogs.nsh b/Contrib/nsDialogs/nsDialogs.nsh
index efd499c9..eeadc09e 100644
--- a/Contrib/nsDialogs/nsDialogs.nsh
+++ b/Contrib/nsDialogs/nsDialogs.nsh
@@ -302,7 +302,7 @@ Header file for creating custom installer pages with nsDialogs
 
 !macro __NSD_GetState CONTROL VAR
 
-	SendMessage ${CONTROL} ${BM_GETSTATE} 0 0 ${VAR}
+	SendMessage ${CONTROL} ${BM_GETCHECK} 0 0 ${VAR}
 
 !macroend