diff --git a/src/os_amiga.h b/src/os_amiga.h
index ba14443988..af64752b04 100644
--- a/src/os_amiga.h
+++ b/src/os_amiga.h
@@ -23,7 +23,6 @@
 # define HAVE_STDLIB_H
 # define HAVE_STRING_H
 # define HAVE_FCNTL_H
-# define HAVE_STRCSPN
 # define HAVE_STRICMP
 # define HAVE_STRNICMP
 # define HAVE_STRFTIME	    // guessed
diff --git a/src/os_mac.h b/src/os_mac.h
index 6c23f4cb66..f171d7ccf6 100644
--- a/src/os_mac.h
+++ b/src/os_mac.h
@@ -84,7 +84,6 @@
 
 #ifndef HAVE_CONFIG_H
 # define HAVE_STRING_H
-# define HAVE_STRCSPN
 # define HAVE_MEMSET
 # define USE_TMPNAM		// use tmpnam() instead of mktemp()
 # define HAVE_FCNTL_H
diff --git a/src/os_vms_conf.h b/src/os_vms_conf.h
index c9e75e68c3..dbf9e8641b 100644
--- a/src/os_vms_conf.h
+++ b/src/os_vms_conf.h
@@ -97,7 +97,6 @@
 
 #define TGETENT_ZERO_ERR
 #define HAVE_GETCWD
-#define HAVE_STRCSPN
 #define HAVE_STRTOL
 #define HAVE_TGETENT
 #define HAVE_MEMSET
diff --git a/src/os_win32.h b/src/os_win32.h
index 26003e52e0..4105a452c4 100644
--- a/src/os_win32.h
+++ b/src/os_win32.h
@@ -22,7 +22,6 @@
 #ifndef HAVE_MATH_H
 # define HAVE_MATH_H
 #endif
-#define HAVE_STRCSPN
 #ifndef __GNUC__
 #define HAVE_STRICMP
 #define HAVE_STRNICMP
diff --git a/src/version.c b/src/version.c
index 2ef00ab81d..f210971805 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1866,
 /**/
     1865,
 /**/