diff --git a/src/basic/proc-cmdline.h b/src/basic/proc-cmdline.h
index bb8b18d3b1..efa88df0a0 100644
--- a/src/basic/proc-cmdline.h
+++ b/src/basic/proc-cmdline.h
@@ -6,9 +6,9 @@
 #include "log.h"
 
 enum {
-        PROC_CMDLINE_STRIP_RD_PREFIX = 1,
-        PROC_CMDLINE_VALUE_OPTIONAL = 2,
-        PROC_CMDLINE_RD_STRICT = 4
+        PROC_CMDLINE_STRIP_RD_PREFIX = 1 << 0,
+        PROC_CMDLINE_VALUE_OPTIONAL  = 1 << 1,
+        PROC_CMDLINE_RD_STRICT       = 1 << 2,
 };
 
 typedef int (*proc_cmdline_parse_t)(const char *key, const char *value, void *data);