diff --git a/mk/tests.mk b/mk/tests.mk
index f46064ebe82..07e13057e36 100644
--- a/mk/tests.mk
+++ b/mk/tests.mk
@@ -491,17 +491,11 @@ $(foreach host,$(CFG_HOST), \
 # Rules for the compiletest tests (rpass, rfail, etc.)
 ######################################################################
 
-RPASS_RC := $(wildcard $(S)src/test/run-pass/*.rc)
 RPASS_RS := $(wildcard $(S)src/test/run-pass/*.rs)
-RPASS_VALGRIND_RC := $(wildcard $(S)src/test/run-pass-valgrind/*.rc)
 RPASS_VALGRIND_RS := $(wildcard $(S)src/test/run-pass-valgrind/*.rs)
-RPASS_FULL_RC := $(wildcard $(S)src/test/run-pass-fulldeps/*.rc)
 RPASS_FULL_RS := $(wildcard $(S)src/test/run-pass-fulldeps/*.rs)
-CFAIL_FULL_RC := $(wildcard $(S)src/test/compile-fail-fulldeps/*.rc)
 CFAIL_FULL_RS := $(wildcard $(S)src/test/compile-fail-fulldeps/*.rs)
-RFAIL_RC := $(wildcard $(S)src/test/run-fail/*.rc)
 RFAIL_RS := $(wildcard $(S)src/test/run-fail/*.rs)
-CFAIL_RC := $(wildcard $(S)src/test/compile-fail/*.rc)
 CFAIL_RS := $(wildcard $(S)src/test/compile-fail/*.rs)
 BENCH_RS := $(wildcard $(S)src/test/bench/*.rs)
 PRETTY_RS := $(wildcard $(S)src/test/pretty/*.rs)
@@ -514,12 +508,12 @@ CODEGEN_CC := $(wildcard $(S)src/test/codegen/*.cc)
 # a performance monitor.
 PERF_RS := $(wildcard $(S)src/test/bench/*.rs)
 
-RPASS_TESTS := $(RPASS_RC) $(RPASS_RS)
-RPASS_VALGRIND_TESTS := $(RPASS_VALGRIND_RC) $(RPASS_VALGRIND_RS)
-RPASS_FULL_TESTS := $(RPASS_FULL_RC) $(RPASS_FULL_RS)
-CFAIL_FULL_TESTS := $(CFAIL_FULL_RC) $(CFAIL_FULL_RS)
-RFAIL_TESTS := $(RFAIL_RC) $(RFAIL_RS)
-CFAIL_TESTS := $(CFAIL_RC) $(CFAIL_RS)
+RPASS_TESTS := $(RPASS_RS)
+RPASS_VALGRIND_TESTS := $(RPASS_VALGRIND_RS)
+RPASS_FULL_TESTS := $(RPASS_FULL_RS)
+CFAIL_FULL_TESTS := $(CFAIL_FULL_RS)
+RFAIL_TESTS := $(RFAIL_RS)
+CFAIL_TESTS := $(CFAIL_RS)
 BENCH_TESTS := $(BENCH_RS)
 PERF_TESTS := $(PERF_RS)
 PRETTY_TESTS := $(PRETTY_RS)