diff --git a/src/clientserver.h b/src/clientserver.h
index 29d01e5ae..d1e250ea8 100644
--- a/src/clientserver.h
+++ b/src/clientserver.h
@@ -118,7 +118,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define PASSWORD_SIZE 28       // Maximum password length. Allows for
                                // base64-encoded SHA-1 (27+\0).
 
-#define TEXTURENAME_ALLOWED_CHARS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_."
+#define TEXTURENAME_ALLOWED_CHARS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.-"
 
 enum ToClientCommand
 {