diff --git a/lib/ykpiv.pc.in b/lib/ykpiv.pc.in
index fc8e8c3..38ff5ad 100644
--- a/lib/ykpiv.pc.in
+++ b/lib/ykpiv.pc.in
@@ -7,6 +7,7 @@ Name: @PACKAGE@
 Description: Yubico PIV C Library
 URL: https://www.yubico.com/
 Version: @VERSION@
+Requires.private: libcrypto
 Libs: -L${libdir} -lykpiv
 Cflags: -I${includedir}/ykpiv