diff --git a/lib/liboath/Makefile.am b/lib/liboath/Makefile.am
index cb9a445..83a20ee 100644
--- a/lib/liboath/Makefile.am
+++ b/lib/liboath/Makefile.am
@@ -12,4 +12,4 @@ liboath_la_SOURCES = \
 	oath_key.c
 
 liboath_la_LDFLAGS = -no-undefined -version-info @LIB_MAJ@
-liboath_la_LIBADD = $(top_builddir)/lib/libpam/libpam.la
+liboath_la_LIBADD = $(top_builddir)/lib/libpam/libpam.la @CRYPTO_LIBS@