diff --git a/src/efivars.h b/src/efivars.h
index 8782714..c7ae3e3 100644
--- a/src/efivars.h
+++ b/src/efivars.h
@@ -38,6 +38,26 @@
 	{0x4aafd29d, 0x68df, 0x49ee, \
 	{0x8a, 0xa9, 0x34, 0x7d, 0x37, 0x56, 0x65, 0xa7}}
 
+#ifndef EFI_VARIABLE_NON_VOLATILE
+#define EFI_VARIABLE_NON_VOLATILE				0x00000001
+#endif
+
+#ifndef EFI_VARIABLE_BOOTSERVICE_ACCESS
+#define EFI_VARIABLE_BOOTSERVICE_ACCESS				0x00000002
+#endif
+
+#ifndef EFI_VARIABLE_RUNTIME_ACCESS
+#define EFI_VARIABLE_RUNTIME_ACCESS				0x00000004
+#endif
+
+#ifndef EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
+#define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS	0x00000020
+#endif
+
+#ifndef EFI_VARIABLE_APPEND_WRITE
+#define EFI_VARIABLE_APPEND_WRITE				0x00000040
+#endif
+
 typedef struct {
 	UINT32		dwLength;
 	UINT16		wRevision;
diff --git a/src/sbvarsign.c b/src/sbvarsign.c
index 3fc4599..3997c96 100644
--- a/src/sbvarsign.c
+++ b/src/sbvarsign.c
@@ -87,16 +87,15 @@ struct attr {
 	int		value;
 };
 
+#define EFI_VAR_ATTR(n) { #n, EFI_VARIABLE_ ## n }
 static struct attr attrs[] = {
-	{ "NON_VOLATILE",				0x0001 },
-	{ "BOOTSERVICE_ACCESS",				0x0002 },
-	{ "RUNTIME_ACCESS",				0x0004 },
-	{ "TIME_BASED_AUTHENTICATED_WRITE_ACCESS",	0x0020 },
-	{ "APPEND_WRITE",				0x0040 },
+	EFI_VAR_ATTR(NON_VOLATILE),
+	EFI_VAR_ATTR(BOOTSERVICE_ACCESS),
+	EFI_VAR_ATTR(RUNTIME_ACCESS),
+	EFI_VAR_ATTR(TIME_BASED_AUTHENTICATED_WRITE_ACCESS),
+	EFI_VAR_ATTR(APPEND_WRITE),
 };
 
-#define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS	0x0020
-
 static uint32_t attr_invalid = 0xffffffffu;
 static const char *attr_prefix = "EFI_VARIABLE_";