diff --git a/alg/third_party/tempestextremes/mk/rules.make b/alg/third_party/tempestextremes/mk/rules.make
index 134f89758..3b9cc7172 100644
--- a/alg/third_party/tempestextremes/mk/rules.make
+++ b/alg/third_party/tempestextremes/mk/rules.make
@@ -7,8 +7,9 @@
 # Rules for compiling object files
 
 # Compilation directories
-DEPDIR= $(BUILDTEDIR)/$(CURDIR)/depend
-BUILDDIR= $(BUILDTEDIR)/$(CURDIR)/build
+
+DEPDIR= $(BUILDTEDIR)/$(notdir $(CURDIR))/depend
+BUILDDIR= $(BUILDTEDIR)/$(notdir $(CURDIR))/build
 
 # Dependency file construction
 MAKEDEPENDCPP= \