diff --git a/debian/rules b/debian/rules
index 4d47b52..baa3005 100755
--- a/debian/rules
+++ b/debian/rules
@@ -2,7 +2,7 @@
 
 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
-export PIKA_BUILD_ARCH = $(shell cat pika-build-arch)
+export PIKA_BUILD_ARCH = $(shell cat ../pika-build-arch)
 dest_dir = $(CURDIR)/debian/linux-firmware
 firmware_dir = $(dest_dir)/lib/firmware
 license_dir = $(dest_dir)/usr/share/doc/linux-firmware/licenses