diff --git a/coverage/Rules.mk b/coverage/Rules.mk
index 873342c40..f137b18c9 100644
--- a/coverage/Rules.mk
+++ b/coverage/Rules.mk
@@ -41,7 +41,7 @@ endif
 
 export IPFS_COVER_DIR:= $(realpath $(d))/sharnesscover/
 
-$(D)/sharness_tests.coverprofile: export TEST_NO_PLUGIN=1
+$(d)/sharness_tests.coverprofile: export TEST_NO_PLUGIN=1
 $(d)/sharness_tests.coverprofile: $(d)/ipfs cmd/ipfs/ipfs-test-cover $(d)/coverage_deps test_sharness_short
 	(cd $(@D)/sharnesscover && find . -type f | gocovmerge -list -) > $@