diff --git a/tools/Makefile.am b/tools/Makefile.am
index 955acbd9..d6386b4a 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -4,6 +4,6 @@ INCLUDES = -I$(top_srcdir)/include
 
 bin_PROGRAMS = curve_keygen
 
-curve_keygen_LDADD = $(top_srcdir)/src/libzmq.la
+curve_keygen_LDADD = $(top_builddir)/src/libzmq.la
 curve_keygen_SOURCES = curve_keygen.c