diff --git a/r3.pc.in b/r3.pc.in
index 1de55c9..3f33047 100644
--- a/r3.pc.in
+++ b/r3.pc.in
@@ -1,4 +1,5 @@
 prefix=@prefix@
+exec_prefix=@exec_prefix@
 includedir=@includedir@/r3
 libdir=@libdir@