diff --git a/cmd/eficonfig.c b/cmd/eficonfig.c
index 4164cb4..7bb92e5 100644
--- a/cmd/eficonfig.c
+++ b/cmd/eficonfig.c
@@ -530,7 +530,7 @@
 	dp = efi_dp_shorten(dp_volume);
 	if (!dp)
 		dp = dp_volume;
-	dp = efi_dp_concat(dp, &fp->dp, false);
+	dp = efi_dp_concat(dp, &fp->dp, 0);
 	free(buf);
 
 	return dp;
@@ -1484,7 +1484,7 @@
 			goto out;
 		}
 		initrd_dp = efi_dp_concat((const struct efi_device_path *)&id_dp,
-					  dp, false);
+					  dp, 0);
 		efi_free_pool(dp);
 	}
 
@@ -1495,7 +1495,7 @@
 	}
 	final_dp_size = efi_dp_size(dp) + sizeof(END);
 	if (initrd_dp) {
-		final_dp = efi_dp_concat(dp, initrd_dp, true);
+		final_dp = efi_dp_concat(dp, initrd_dp, 1);
 		final_dp_size += efi_dp_size(initrd_dp) + sizeof(END);
 	} else {
 		final_dp = efi_dp_dup(dp);
diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index e978e74..186d62e 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -696,7 +696,7 @@
 		short_fp = tmp_fp;
 
 	initrd_dp = efi_dp_concat((const struct efi_device_path *)&id_dp,
-				  short_fp, false);
+				  short_fp, 0);
 
 out:
 	efi_free_pool(tmp_dp);
@@ -916,7 +916,7 @@
 		goto out;
 	}
 
-	final_fp = efi_dp_concat(file_path, initrd_dp, true);
+	final_fp = efi_dp_concat(file_path, initrd_dp, 1);
 	if (!final_fp) {
 		printf("Cannot create final device path\n");
 		r = CMD_RET_FAILURE;
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 9600941..ddf2e41 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -946,7 +946,7 @@
 				       const efi_guid_t *guid);
 struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1,
 				      const struct efi_device_path *dp2,
-				      bool split_end_node);
+				      size_t split_end_node);
 struct efi_device_path *search_gpt_dp_node(struct efi_device_path *device_path);
 efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
 					 efi_uintn_t *size);
diff --git a/lib/efi_loader/efi_bootbin.c b/lib/efi_loader/efi_bootbin.c
index b7910f7..a87006b 100644
--- a/lib/efi_loader/efi_bootbin.c
+++ b/lib/efi_loader/efi_bootbin.c
@@ -150,7 +150,7 @@
 		msg_path = file_path;
 	} else {
 		file_path = efi_dp_concat(bootefi_device_path,
-					  bootefi_image_path, false);
+					  bootefi_image_path, 0);
 		msg_path = bootefi_image_path;
 		log_debug("Loaded from disk\n");
 	}
diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index 7da3139..b0bf21c 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -130,7 +130,7 @@
 		if (!dp)
 			continue;
 
-		dp = efi_dp_concat(dp, fp, false);
+		dp = efi_dp_concat(dp, fp, 0);
 		if (!dp)
 			continue;
 
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 1951291..630c5f5 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1816,7 +1816,7 @@
 	if (device_path) {
 		info->device_handle = efi_dp_find_obj(device_path, NULL, NULL);
 
-		dp = efi_dp_concat(device_path, file_path, false);
+		dp = efi_dp_concat(device_path, file_path, 0);
 		if (!dp) {
 			ret = EFI_OUT_OF_RESOURCES;
 			goto failure;
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index aec224d..18be8a1 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -276,10 +276,11 @@
  *
  * @dp1:	    First device path
  * @dp2:	    Second device path
- * @split_end_node: If true the two device paths will be concatenated and
- *                  separated by an end node (DEVICE_PATH_SUB_TYPE_END).
- *		    If false the second device path will be concatenated to the
- *		    first one as-is.
+ * @split_end_node:
+ * * 0 to concatenate
+ * * 1 to concatenate with end node added as separator
+ * * size of dp1 excluding last end node to concatenate with end node as
+ *   separator in case dp1 contains an end node
  *
  * Return:
  * concatenated device path or NULL. Caller must free the returned value
@@ -287,7 +288,7 @@
 struct
 efi_device_path *efi_dp_concat(const struct efi_device_path *dp1,
 			       const struct efi_device_path *dp2,
-			       bool split_end_node)
+			       size_t split_end_node)
 {
 	struct efi_device_path *ret;
 	size_t end_size;
@@ -301,10 +302,15 @@
 		ret = efi_dp_dup(dp1);
 	} else {
 		/* both dp1 and dp2 are non-null */
-		unsigned sz1 = efi_dp_size(dp1);
-		unsigned sz2 = efi_dp_size(dp2);
+		size_t sz1;
+		size_t sz2 = efi_dp_size(dp2);
 		void *p;
 
+		if (split_end_node < sizeof(struct efi_device_path))
+			sz1 = efi_dp_size(dp1);
+		else
+			sz1 = split_end_node;
+
 		if (split_end_node)
 			end_size = 2 * sizeof(END);
 		else
diff --git a/lib/efi_loader/efi_device_path_utilities.c b/lib/efi_loader/efi_device_path_utilities.c
index c95dbfa..ac250bb 100644
--- a/lib/efi_loader/efi_device_path_utilities.c
+++ b/lib/efi_loader/efi_device_path_utilities.c
@@ -76,7 +76,7 @@
 	const struct efi_device_path *src2)
 {
 	EFI_ENTRY("%pD, %pD", src1, src2);
-	return EFI_EXIT(efi_dp_concat(src1, src2, false));
+	return EFI_EXIT(efi_dp_concat(src1, src2, 0));
 }
 
 /*