diff --git a/common/main/cntrlcen.h b/common/main/cntrlcen.h
index 4fb0713c1..766576298 100644
--- a/common/main/cntrlcen.h
+++ b/common/main/cntrlcen.h
@@ -27,6 +27,7 @@ COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
 
 #include <physfs.h>
 
+#include "backports-ranges.h"
 #include "fwd-object.h"
 #include "pack.h"
 #include "fwd-robot.h"
@@ -104,7 +105,7 @@ extern unsigned Num_reactors;
 /*
  * reads n reactor structs from a PHYSFS_File
  */
-void reactor_read_n(PHYSFS_File *fp, partial_range_t<reactor *> r);
+void reactor_read_n(PHYSFS_File *fp, ranges::subrange<reactor *> r);
 #endif
 
 extern std::array<reactor, MAX_REACTORS> Reactors;
diff --git a/similar/main/cntrlcen.cpp b/similar/main/cntrlcen.cpp
index af486634e..6d8df3448 100644
--- a/similar/main/cntrlcen.cpp
+++ b/similar/main/cntrlcen.cpp
@@ -553,7 +553,7 @@ void special_reactor_stuff()
 /*
  * reads n reactor structs from a PHYSFS_File
  */
-void reactor_read_n(PHYSFS_File *fp, partial_range_t<reactor *> r)
+void reactor_read_n(PHYSFS_File *fp, ranges::subrange<reactor *> r)
 {
 	range_for (auto &i, r)
 	{