diff --git a/tool/create_builddir b/tool/create_builddir
index 8ba8870077..3e8170c582 100755
--- a/tool/create_builddir
+++ b/tool/create_builddir
@@ -160,6 +160,7 @@ foc_x86_32::
 
 foc_x86_64::
 	@echo "SPECS = genode foc_x86_64" > $(BUILD_DIR)/etc/specs.conf
+	@echo "SPECS += acpi"             >> $(BUILD_DIR)/etc/specs.conf
 
 nova_x86_32::
 	@echo "SPECS  = genode nova_x86_32" > $(BUILD_DIR)/etc/specs.conf
@@ -167,6 +168,7 @@ nova_x86_32::
 
 nova_x86_64::
 	@echo "SPECS = genode nova_x86_64" > $(BUILD_DIR)/etc/specs.conf
+	@echo "SPECS += acpi"             >> $(BUILD_DIR)/etc/specs.conf
 
 foc_pbxa9::
 	@echo "SPECS = genode foc_pbxa9" > $(BUILD_DIR)/etc/specs.conf