diff --git a/programs/pkey/dh_genprime.c b/programs/pkey/dh_genprime.c
index 84f498e..91fddf3 100644
--- a/programs/pkey/dh_genprime.c
+++ b/programs/pkey/dh_genprime.c
@@ -46,7 +46,7 @@
 
 #define USAGE \
     "\n usage: dh_genprime param=<>...\n"                                   \
-    "\n acceprable parameters:\n"                                           \
+    "\n acceptable parameters:\n"                                           \
     "    bits=%%d           default: 2048\n"
 
 #define DFL_BITS    2048
diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
index 41d4bfe..6b314d8 100644
--- a/programs/ssl/dtls_client.c
+++ b/programs/ssl/dtls_client.c
@@ -348,6 +348,6 @@
     mbedtls_exit( ret );
 }
 #endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_PROTO_DTLS && MBEDTLS_NET_C &&
-          MBEDTLD_TIMING_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
+          MBEDTLS_TIMING_C && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
           MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_RSA_C && MBEDTLS_CERTS_C &&
           MBEDTLS_PEM_PARSE_C */
diff --git a/programs/test/udp_proxy.c b/programs/test/udp_proxy.c
index 48970e9..5fcfa0f 100644
--- a/programs/test/udp_proxy.c
+++ b/programs/test/udp_proxy.c
@@ -378,7 +378,7 @@
 
 #if defined(MBEDTLS_TIMING_C)
 /* Return elapsed time in milliseconds since the first call */
-static unsigned ellapsed_time( void )
+static unsigned elapsed_time( void )
 {
     static int initialized = 0;
     static struct mbedtls_timing_hr_time hires;
@@ -414,9 +414,9 @@
     int ret;
 
     mbedtls_printf( "  %05u flush    %s: %u bytes, %u datagrams, last %u ms\n",
-                    ellapsed_time(), buf->description,
+                    elapsed_time(), buf->description,
                     (unsigned) buf->len, buf->num_datagrams,
-                    ellapsed_time() - buf->packet_lifetime );
+                    elapsed_time() - buf->packet_lifetime );
 
     ret = mbedtls_net_send( buf->ctx, buf->data, buf->len );
 
@@ -428,7 +428,7 @@
 
 static unsigned ctx_buffer_time_remaining( ctx_buffer *buf )
 {
-    unsigned const cur_time = ellapsed_time();
+    unsigned const cur_time = elapsed_time();
 
     if( buf->num_datagrams == 0 )
         return( (unsigned) -1 );
@@ -468,7 +468,7 @@
 
     buf->len += len;
     if( ++buf->num_datagrams == 1 )
-        buf->packet_lifetime = ellapsed_time();
+        buf->packet_lifetime = elapsed_time();
 
     return( (int) len );
 }
@@ -518,10 +518,10 @@
 #if defined(MBEDTLS_TIMING_C)
     if( why == NULL )
         mbedtls_printf( "  %05u dispatch %s %s (%u bytes)\n",
-                ellapsed_time(), p->way, p->type, p->len );
+                elapsed_time(), p->way, p->type, p->len );
     else
         mbedtls_printf( "  %05u dispatch %s %s (%u bytes): %s\n",
-                ellapsed_time(), p->way, p->type, p->len, why );
+                elapsed_time(), p->way, p->type, p->len, why );
 #else
     if( why == NULL )
         mbedtls_printf( "        dispatch %s %s (%u bytes)\n",
diff --git a/programs/x509/cert_req.c b/programs/x509/cert_req.c
index 9cd70d4..ab04648 100644
--- a/programs/x509/cert_req.c
+++ b/programs/x509/cert_req.c
@@ -358,7 +358,7 @@
     if( ( ret = write_certificate_request( &req, opt.output_file,
                                            mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
     {
-        mbedtls_printf( " failed\n  !  write_certifcate_request %d", ret );
+        mbedtls_printf( " failed\n  !  write_certificate_request %d", ret );
         goto exit;
     }
 
diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index cdd614a..30e9e0a 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -672,7 +672,7 @@
         if( ret != 0 )
         {
             mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  x509write_crt_set_basic_contraints "
+            mbedtls_printf( " failed\n  !  x509write_crt_set_basic_constraints "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
         }