diff --git a/lib/libefivar/efivar-dp-format.c b/lib/libefivar/efivar-dp-format.c
index 0f5db4d12b60..ca122ef63c36 100644
--- a/lib/libefivar/efivar-dp-format.c
+++ b/lib/libefivar/efivar-dp-format.c
@@ -2430,3 +2430,9 @@ efidp_format_device_path(char *buf, size_t len, const_efidp dp, ssize_t max)
 
 	return retval;
 }
+
+size_t
+efidp_size(const_efidp dp)
+{
+	return GetDevicePathSize(__DECONST(EFI_DEVICE_PATH_PROTOCOL *, dp));
+}
diff --git a/lib/libefivar/efivar-dp.h b/lib/libefivar/efivar-dp.h
index 94dd1189cebe..f620a67550a0 100644
--- a/lib/libefivar/efivar-dp.h
+++ b/lib/libefivar/efivar-dp.h
@@ -62,4 +62,6 @@ ssize_t efidp_format_device_path(char *buf, size_t len, const_efidp dp,
     ssize_t max);
 ssize_t efidp_parse_device_path(char *path, efidp out, size_t max);
 
+size_t efidp_size(const_efidp);
+
 #endif /* _EFIVAR_DP_H_ */