diff --git a/ChangeLog b/ChangeLog
index f96380bf..d006b8c5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,9 @@
 	* src/files.c (save_history, save_poshistory): Don't make the user
 	hit Enter when there's an error saving history state at exit; it is
 	pointless and annoying.  Just notify the user and move on.
+	* src/nano.c (main): On most 64-bit systems, casting a pointer to
+	an integer can cause valid pointers to be truncated and rejected.
+	Rework the code to test for the two invalid values directly.
 
 2015-12-23  Christian Weisgerber  <naddy@mips.inka.de>
 	* configure.ac: AC_CHECK_HEADERS_ONCE() is very special and cannot be
diff --git a/src/nano.c b/src/nano.c
index 1af88dc9..0780ebcd 100644
--- a/src/nano.c
+++ b/src/nano.c
@@ -2574,11 +2574,14 @@ int main(int argc, char **argv)
 #endif
 
 #if !defined(NANO_TINY) && defined(HAVE_KEY_DEFINED)
+    const char *keyvalue;
     /* Ask ncurses for the key codes for Control+Left and Control+Right. */
-    if ((int)tigetstr("kLFT5") > 0)
-	controlleft = key_defined(tigetstr("kLFT5"));
-    if ((int)tigetstr("kRIT5") > 0)
-	controlright = key_defined(tigetstr("kRIT5"));
+    keyvalue = tigetstr("kLFT5");
+    if (keyvalue != 0 && keyvalue != (char *)-1)
+	controlleft = key_defined(keyvalue);
+    keyvalue = tigetstr("kRIT5");
+    if (keyvalue != 0 && keyvalue != (char *)-1)
+	controlright = key_defined(keyvalue);
 #endif
 
 #ifdef DEBUG