diff --git a/repos/ports/lib/mk/virtualbox-common.inc b/repos/ports/lib/mk/virtualbox-common.inc
index 68af32923..090ef03cc 100644
--- a/repos/ports/lib/mk/virtualbox-common.inc
+++ b/repos/ports/lib/mk/virtualbox-common.inc
@@ -1,3 +1,5 @@
+REQUIRES += x86
+
 VBOX_MACH := $(filter $(SPECS), x86_32 x86_64)
 
 VBOX_MACH_CC_OPT_x86_32  = -DRT_ARCH_X86 -D__X86__
diff --git a/repos/ports/lib/mk/virtualbox5-common.inc b/repos/ports/lib/mk/virtualbox5-common.inc
index 0373c6205..7bb6d9482 100644
--- a/repos/ports/lib/mk/virtualbox5-common.inc
+++ b/repos/ports/lib/mk/virtualbox5-common.inc
@@ -1,3 +1,5 @@
+REQUIRES += x86
+
 VBOX_MACH := $(filter $(SPECS), x86_32 x86_64)
 
 VBOX_MACH_CC_OPT_x86_32  = -DRT_ARCH_X86 -D__X86__