diff --git a/rtl/objpas/sysutils/syshelpb.inc b/rtl/objpas/sysutils/syshelpb.inc
index c472ea21c1..3daaf21009 100644
--- a/rtl/objpas/sysutils/syshelpb.inc
+++ b/rtl/objpas/sysutils/syshelpb.inc
@@ -1,3 +1,4 @@
+{%MainUnit sysutils.pp}
 
 Class Function TBOOLHELPER.Parse(const S: string): Boolean; inline; static;
 
diff --git a/rtl/objpas/sysutils/syshelpf.inc b/rtl/objpas/sysutils/syshelpf.inc
index b8958356b0..61acfa7014 100644
--- a/rtl/objpas/sysutils/syshelpf.inc
+++ b/rtl/objpas/sysutils/syshelpf.inc
@@ -1,3 +1,4 @@
+{%MainUnit sysutils.pp}
 Class Function TFLOATHELPER.IsNan(const AValue: FLOATTYPE): Boolean; overload; inline; static;
 
 begin