diff --git a/lib/roken/roken.h b/lib/roken/roken.h
index b310c9105..5f522767f 100644
--- a/lib/roken/roken.h
+++ b/lib/roken/roken.h
@@ -42,7 +42,7 @@ char *strerror(int eno);
 #endif
 
 #ifndef HAVE_HSTRERROR
-const char *hstrerror(int herr);
+char *hstrerror(int herr);
 #endif
 
 #ifndef HAVE_HERROR
diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index b310c9105..5f522767f 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -42,7 +42,7 @@ char *strerror(int eno);
 #endif
 
 #ifndef HAVE_HSTRERROR
-const char *hstrerror(int herr);
+char *hstrerror(int herr);
 #endif
 
 #ifndef HAVE_HERROR