diff --git a/.github/release-canary-v3 b/.github/release-canary-v3
index 00750ed..b8626c4 100644
--- a/.github/release-canary-v3
+++ b/.github/release-canary-v3
@@ -1 +1 @@
-3
+4
diff --git a/debian/rules b/debian/rules
index b00457c..54e721c 100755
--- a/debian/rules
+++ b/debian/rules
@@ -9,7 +9,7 @@ export PIKA_BUILD_ARCH = $(shell cat ../pika-build-arch)
 override_dh_prep:
 # amd64 build prep
 ifeq (amd64-v3,$(PIKA_BUILD_ARCH))
-export RUSTFLAGS=" -C target-cpu=x86-64-v3 -Clinker-plugin-lto -Copt-level=3 "
+export RUSTFLAGS = "-C target-cpu=x86-64-v3" "-C linker-plugin-lto" "-Copt-level=3"
 endif
 
 BUILDFLAGS := --release