diff --git a/support/Z80.pc.in b/support/Z80.pc.in
index d28e086..5271cdd 100644
--- a/support/Z80.pc.in
+++ b/support/Z80.pc.in
@@ -7,5 +7,6 @@ Name: @PROJECT_NAME@
 Description: @PROJECT_DESCRIPTION@.
 URL: https://zxe.io/software/@PROJECT_NAME@
 Version: @PROJECT_VERSION@
-Libs: -L${libdir} -l@PROJECT_NAME@
+Requires: Zeta
 Cflags: -I${includedir}
+Libs: -L${libdir} -l@PROJECT_NAME@