diff --git a/packages/arosunits/src/exec.pas b/packages/arosunits/src/exec.pas
index 6efd9cf0f3..bef3a5b4d8 100644
--- a/packages/arosunits/src/exec.pas
+++ b/packages/arosunits/src/exec.pas
@@ -652,6 +652,10 @@ type
 {$endif}
 {$endif}
 {$endif}
+{$else}
+{$ifndef CPUM68K}
+    mp_Private: array[0..1] of IPTR; // Private extension field
+{$endif}
 {$endif}
   end;
 
diff --git a/rtl/aros/i386/execd.inc b/rtl/aros/i386/execd.inc
index 01c5896b37..617855fd89 100644
--- a/rtl/aros/i386/execd.inc
+++ b/rtl/aros/i386/execd.inc
@@ -618,6 +618,10 @@ type  // Checked OK 05.08.2011 ALB
 {$endif}
 {$endif}
 {$endif}
+{$else}
+{$ifndef CPUM68K}
+    mp_Private: array[0..1] of PtrUInt;
+{$endif}
 {$endif}
   end;