diff --git a/pika-sources/debian/rules b/pika-sources/debian/rules
index 2bfe8e7..5f6df69 100755
--- a/pika-sources/debian/rules
+++ b/pika-sources/debian/rules
@@ -1,6 +1,6 @@
 #!/usr/bin/make -f
 
-export PIKA_BUILD_ARCH = $(shell cat pika-build-arch)
+export PIKA_BUILD_ARCH = $(shell cat ../pika-build-arch)
 
 %:
 	dh $@