diff --git a/Implementierung/Makefile b/Implementierung/Makefile
index 843d95b..228eb39 100644
--- a/Implementierung/Makefile
+++ b/Implementierung/Makefile
@@ -1,6 +1,6 @@
 
 
-SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c
+SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c src/md2_impls/md2_1.c
 OBJ = ${subst src,build,${SRC:.c=.o}}
 CC = gcc
 CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
diff --git a/Implementierung/src/md2.c b/Implementierung/src/md2.c
index da49453..de9b908 100644
--- a/Implementierung/src/md2.c
+++ b/Implementierung/src/md2.c
@@ -2,6 +2,7 @@
 
 // include all implementations
 #include "../lib/md2_impls/md2_0.h"
+#include "../lib/md2_impls/md2_1.h"
 #include "../lib/md2_impls/md2_2.h"
 
 md2_hash_func md2_hash;
@@ -23,6 +24,11 @@ bool md2_choose_implementation(int i) {
       md2_checksum = md2_checksum_0;
       return true;
 
+    case 1:
+      md2_hash = md2_hash_1;
+      md2_checksum = md2_checksum_1;
+      return true;
+
     case 2:
       md2_hash = md2_hash_2;
       md2_checksum = md2_checksum_2;