Index: apps/app_mixmonitor.c
===================================================================
--- apps/app_mixmonitor.c	(revision 309634)
+++ apps/app_mixmonitor.c	(working copy)
@@ -280,6 +280,7 @@
 	struct ast_filestream **fs = NULL;
 	unsigned int oflags;
 	char *ext;
+	char *last_slash;
 	int errflag = 0;
 	struct ast_format format_slin;
 
@@ -312,8 +313,9 @@
 			if (!*fs && !errflag && !mixmonitor->mixmonitor_ds->fs_quit) {
 				oflags = O_CREAT | O_WRONLY;
 				oflags |= ast_test_flag(mixmonitor, MUXFLAG_APPEND) ? O_APPEND : O_TRUNC;
-
-				if ((ext = strrchr(mixmonitor->filename, '.')))
+				
+				last_slash = strrchr(mixmonitor->filename, '/');
+				if ((ext = strrchr(mixmonitor->filename, '.')) && (ext > last_slash))
 					*(ext++) = '\0';
 				else
 					ext = "raw";