diff --git a/hal/halarm/generic/processor.c b/hal/halarm/generic/processor.c
index 81fb5145b3a..e48358ab6c7 100644
--- a/hal/halarm/generic/processor.c
+++ b/hal/halarm/generic/processor.c
@@ -14,7 +14,7 @@
 
 /* GLOBALS ********************************************************************/
 
-LONG HalpActiveProcessors;
+KAFFINITY HalpActiveProcessors;
 KAFFINITY HalpDefaultInterruptAffinity;
 BOOLEAN HalpProcessorIdentified;
 BOOLEAN HalpTestCleanSupported;