diff --git a/libpromises/changes_chroot.c b/libpromises/changes_chroot.c
index 062b387027b..82fd1ff30bc 100644
--- a/libpromises/changes_chroot.c
+++ b/libpromises/changes_chroot.c
@@ -265,7 +265,7 @@ bool RecordFileEvaluatedInChroot(const char *path)
     return ret;
 }
 
-bool RecordPkgOperationInChroot(const char *op, const char *name, const char *arch, const char *version)
+bool RecordPkgOperationInChroot(const char *op, const char *name, const char *version, const char *arch)
 {
     assert(op != NULL);
     assert(name != NULL);
diff --git a/libpromises/changes_chroot.h b/libpromises/changes_chroot.h
index e17b25763a3..a325aaed31c 100644
--- a/libpromises/changes_chroot.h
+++ b/libpromises/changes_chroot.h
@@ -34,6 +34,6 @@ void PrepareChangesChroot(const char *path);
 bool RecordFileChangedInChroot(const char *path);
 bool RecordFileRenamedInChroot(const char *old_name, const char *new_name);
 bool RecordFileEvaluatedInChroot(const char *path);
-bool RecordPkgOperationInChroot(const char *op, const char *name, const char *arch, const char *version);
+bool RecordPkgOperationInChroot(const char *op, const char *name, const char *version, const char *arch);
 
 #endif /* CFENGINE_CHANGES_CHROOT_H */