diff --git a/test/Makefile b/test/Makefile
index 832646ae2b2..ae7fea19507 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -141,7 +141,7 @@ site.exp: Makefile $(LLVM_OBJ_ROOT)/Makefile.config
 	@echo '# Do not edit here.  If you wish to override these values' >>site.tmp
 	@echo '# edit the last section' >>site.tmp
 	@echo "set target_triplet $(TARGET_TRIPLE)" >> site.tmp
-	@echo 'set prcontext "tclsh $(LLVM_SRC_ROOT)/test/Scripts/prcontext.tcl"' >> site.tmp
+	@echo 'set prcontext "$(TCLSH) $(LLVM_SRC_ROOT)/test/Scripts/prcontext.tcl"' >> site.tmp
 	@echo 'set srcdir $(LLVM_SRC_ROOT)/test' >>site.tmp
 	@echo "set objdir $(LLVM_OBJ_ROOT)/test" >>site.tmp
 	@echo 'set llvmgcc $(LLVMGCCDIR)/bin/gcc' >> site.tmp