diff --git a/source3/include/MacExtensions.h b/source3/include/MacExtensions.h
index 23dcde9737e..6cd3d41370f 100644
--- a/source3/include/MacExtensions.h
+++ b/source3/include/MacExtensions.h
@@ -80,7 +80,7 @@ typedef struct _SambaAfpInfo
 */
 
 /*
-** These extensions are only supported with the NT LM 0.12 Dialect. These extentions
+** These extensions are only supported with the NT LM 0.12 Dialect. These extensions
 ** will be process on a share by share bases.
 */
 
diff --git a/source4/heimdal/lib/asn1/rfc2459.asn1 b/source4/heimdal/lib/asn1/rfc2459.asn1
index 5df9e41fffd..bf82f81d9e3 100644
--- a/source4/heimdal/lib/asn1/rfc2459.asn1
+++ b/source4/heimdal/lib/asn1/rfc2459.asn1
@@ -543,13 +543,13 @@ ProxyCertInfo ::= SEQUENCE {
 id-uspkicommon-card-id OBJECT IDENTIFIER ::= { 2 16 840 1 101 3 6 6 }
 id-uspkicommon-piv-interim OBJECT IDENTIFIER ::= { 2 16 840 1 101 3 6 9 1 }
 
---- Netscape extentions
+--- Netscape extensions
 
 id-netscape OBJECT IDENTIFIER ::=
     { joint-iso-itu-t(2) country(16) us(840) organization(1) netscape(113730) }
 id-netscape-cert-comment OBJECT IDENTIFIER ::= { id-netscape 1 13 }
 
---- MS extentions
+--- MS extensions
 
 id-ms-cert-enroll-domaincontroller OBJECT IDENTIFIER ::=
     { 1 3 6 1 4 1 311 20 2 }
diff --git a/source4/heimdal/lib/gssapi/gssapi/gssapi_oid.h b/source4/heimdal/lib/gssapi/gssapi/gssapi_oid.h
index 9465efc77f4..3d00c060d10 100644
--- a/source4/heimdal/lib/gssapi/gssapi/gssapi_oid.h
+++ b/source4/heimdal/lib/gssapi/gssapi/gssapi_oid.h
@@ -4,7 +4,7 @@
 
  /* contact Love Hörnquist Åstrand <lha@h5l.org> for new oid arcs */
  /*
-  * 1.2.752.43.13 Heimdal GSS-API Extentions
+  * 1.2.752.43.13 Heimdal GSS-API Extensions
   */
 extern GSSAPI_LIB_VARIABLE gss_OID_desc __gss_krb5_copy_ccache_x_oid_desc;
 #define GSS_KRB5_COPY_CCACHE_X (&__gss_krb5_copy_ccache_x_oid_desc)