--- a/bctoolbox.pc.in
+++ b/bctoolbox.pc.in
@@ -8,3 +8,4 @@ Version: @PROJECT_VERSION@
 Libs: -L@CMAKE_INSTALL_FULL_LIBDIR@ -lbctoolbox
 Libs.private: @LIBS_PRIVATE@
 Cflags: -I@CMAKE_INSTALL_FULL_INCLUDEDIR@
+Requires.private: bcunit zlib