diff --git a/libhammer.pc.in b/libhammer.pc.in
index 97ded13..c1e3c86 100644
--- a/libhammer.pc.in
+++ b/libhammer.pc.in
@@ -1,4 +1,4 @@
-prefix=/usr
+prefix=${prefix}
 exec_prefix=${prefix}
 includedir=${prefix}/include
 libdir=${exec_prefix}/lib
@@ -6,5 +6,5 @@ libdir=${exec_prefix}/lib
 Name: libhammer
 Description: The Hammer parsing library
 Version: 0.9.0
-Cflags: -I${includedir}/hammer
+Cflags: -I${includedir}
 Libs: -L${libdir} -lhammer