diff --git a/include/geos/gdisk.h b/include/geos/gdisk.h
index 6a0ed923e..ac6438117 100644
--- a/include/geos/gdisk.h
+++ b/include/geos/gdisk.h
@@ -50,7 +50,7 @@ char __fastcall__ ChangeDiskDevice(char newdev);
 #define	OFF_GS_DTYPE	189
 #define	OFF_OP_TR_SC	171
 #define	OFF_GS_ID	173
-/* disk errors reported in oserrno */
+/* disk errors reported in _oserror */
 #define	ANY_FAULT	0xf0
 #define G_EOF		0
 #define	NO_BLOCKS	1
diff --git a/libsrc/common/_poserror.c b/libsrc/common/_poserror.c
index b0b939106..95dbfdc9d 100644
--- a/libsrc/common/_poserror.c
+++ b/libsrc/common/_poserror.c
@@ -41,7 +41,7 @@
 
 void __fastcall__ _poserror (const char* msg)
 {
-    /* Fetch the message that corresponds to _oserrno */
+    /* Fetch the message that corresponds to _oserror */
     const char* errormsg = _stroserror (_oserror);
 
     /* Different output depending on msg */