diff --git a/src/core/open.c b/src/core/open.c
index c27d8a021..f9198c9d9 100644
--- a/src/core/open.c
+++ b/src/core/open.c
@@ -25,6 +25,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdarg.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include <ipxe/xfer.h>
 #include <ipxe/uri.h>
@@ -47,7 +48,7 @@ struct uri_opener * xfer_uri_opener ( const char *scheme ) {
 	struct uri_opener *opener;
 
 	for_each_table_entry ( opener, URI_OPENERS ) {
-		if ( strcmp ( scheme, opener->scheme ) == 0 )
+		if ( strcasecmp ( scheme, opener->scheme ) == 0 )
 			return opener;
 	}
 	return NULL;
diff --git a/src/net/tcp/httpconn.c b/src/net/tcp/httpconn.c
index f9221b27e..538c4dcf6 100644
--- a/src/net/tcp/httpconn.c
+++ b/src/net/tcp/httpconn.c
@@ -32,6 +32,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <errno.h>
 #include <byteswap.h>
 #include <ipxe/tcpip.h>
@@ -63,7 +64,7 @@ static struct http_scheme * http_scheme ( struct uri *uri ) {
 
 	/* Identify scheme */
 	for_each_table_entry ( scheme, HTTP_SCHEMES ) {
-		if ( strcmp ( uri->scheme, scheme->name ) == 0 )
+		if ( strcasecmp ( uri->scheme, scheme->name ) == 0 )
 			return scheme;
 	}