diff --git a/src/Makefile.am b/src/Makefile.am
index e17bc77d9e..27c1f7c2be 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -96,7 +96,7 @@ if HAVE_GDAKI
 noinst_LTLIBRARIES += libefa_cuda_dp.la
 
 libefa_cuda_dp_la_SOURCES = \
-	$(top_srcdir)/3rd-party/efa-dp-direct/CUDA/host/efa_cuda_dp.cpp
+	../3rd-party/efa-dp-direct/CUDA/host/efa_cuda_dp.cpp
 
 libefa_cuda_dp_la_CPPFLAGS = \
 	$(CUDA_CPPFLAGS) \