diff --git a/src/aeb_fate_generate_ops.erl b/src/aeb_fate_generate_ops.erl
index 63659f7..6c08d9a 100644
--- a/src/aeb_fate_generate_ops.erl
+++ b/src/aeb_fate_generate_ops.erl
@@ -78,7 +78,7 @@ ops_defs() ->
     , { 'HD',           16#35,    2,  false,   3, [a,a],                hd, "Arg0 := head of list Arg1."}
     , { 'TL',           16#36,    2,  false,   3, [a,a],                tl, "Arg0 := tail of list Arg1."}
     , { 'LENGTH',       16#37,    2,  false,   3, [a,a],            length, "Arg0 := length of list Arg1."}
-    , { 'STR_EQ',       16#38,    3,  false,   3, [a,a,a],          str_eq, "Arg0 := true iff the strings Arg1 and Arg2 are the same."}
+    , { 'APPEND',       16#38,    3,  false,   3, [a,a,a],          append, "Arg0 := Arg1 ++ Arg2."}
     , { 'STR_JOIN',     16#39,    3,  false,   3, [a,a,a],        str_join, "Arg0 := string Arg1 followed by string Arg2."}
     , { 'INT_TO_STR',   16#40,    2,  false,   3, [a,a],        int_to_str, "Arg0 := turn integer Arg1 into a string."}
     , { 'ADDR_TO_STR',  16#41,    2,  false,   3, [a,a],       addr_to_str, "Arg0 := turn address Arg1 into a string."}
diff --git a/test/asm_code/all_instructions.fate b/test/asm_code/all_instructions.fate
index 1cdfeb0..e8cdb29 100644
--- a/test/asm_code/all_instructions.fate
+++ b/test/asm_code/all_instructions.fate
@@ -104,7 +104,7 @@ FUNCTION foo () : {tuple, []}
 
   LENGTH var216 a143
 
-  STR_EQ { 203961992615221001243597889146034217896 => 0x1f53a1843} 281217554184165828643225535776787296845 a177
+  APPEND { 203961992615221001243597889146034217896 => 0x1f53a1843} 281217554184165828643225535776787296845 a177
 
   STR_JOIN a a 7144184027126178769820155907121270843348