diff --git a/hx.hs b/hx.hs
index 5c436ee..2cf3c75 100644
--- a/hx.hs
+++ b/hx.hs
@@ -558,7 +558,7 @@ mainArgs ("ec-int-modn":args)        = interactArgsLn hx_ec_int_modn args
 mainArgs ("ec-x":args)               = interactArgsLn hx_ec_x args
 mainArgs ("ec-y":args)               = interactArgsLn hx_ec_y args
 
-mainArgs ("mktx":file:args)          = BS.writeFile (B8.unpack file) $ hx_mktx args
+mainArgs ("mktx":file:args)          = interactFileArgs hx_mktx file args
 mainArgs ["sign-input",f,i,s]        = hx_sign_input f i s
 mainArgs ["set-input",f,i,s]         = hx_set_input f i s
 mainArgs ["validsig",f,i,s,sig]      = hx_validsig f i s sig
diff --git a/tests/sx-tuto-mktx-stdin-stdout.t/TESTRECIPE b/tests/sx-tuto-mktx-stdin-stdout.t/TESTRECIPE
new file mode 100644
index 0000000..cad6e99
--- /dev/null
+++ b/tests/sx-tuto-mktx-stdin-stdout.t/TESTRECIPE
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+testname=sx-tuto-mktx-stdin-stdout.t
+command=hx
+args=( mktx - --input 97e06e49dfdd26c5a904670971ccf4c7fe7d9da53cb379bf9b442fc9427080b3:1 --output - )
+exit_code=0
+stdin_file=stdin
+stdout_file=stdout
+stderr_file=/dev/null
+sources=( )
+products=( )
+
+# Environment variables:
+env_vars=( )
+
+setup(){
+  : Perform here actions to be run before the tested program
+}
+
+munge(){
+  : Munge here the results of the tested program to ease the check
+}
+
+check(){
+  check_exit_code &&
+  check_stderr &&
+  check_stdout &&
+  check_products &&
+  : Perform here extra checks on the tested program
+}
+
+explain(){
+  explain_exit_code
+  explain_stdout
+  explain_stderr
+  explain_products
+  : Explain here more potential differences
+}
+
+teardown(){
+  : Undo here the actions of setup
+}
diff --git a/tests/sx-tuto-mktx-stdin-stdout.t/stdin b/tests/sx-tuto-mktx-stdin-stdout.t/stdin
new file mode 100644
index 0000000..7bd08d4
--- /dev/null
+++ b/tests/sx-tuto-mktx-stdin-stdout.t/stdin
@@ -0,0 +1 @@
+1MyKMeDsom7rYcp69KpbKn4DcyuvLMkLYJ:90000
diff --git a/tests/sx-tuto-mktx-stdin-stdout.t/stdout b/tests/sx-tuto-mktx-stdin-stdout.t/stdout
new file mode 100644
index 0000000..e475bbc
--- /dev/null
+++ b/tests/sx-tuto-mktx-stdin-stdout.t/stdout
@@ -0,0 +1 @@
+0100000001b3807042c92f449bbf79b33ca59d7dfec7f4cc71096704a9c526dddf496ee0970100000000ffffffff01905f0100000000001976a914e60921dbfe1e066113f1c6e0ea15517234187d4788ac00000000
\ No newline at end of file
diff --git a/tests/sx-tuto-mktx-stdout.t/TESTRECIPE b/tests/sx-tuto-mktx-stdout.t/TESTRECIPE
new file mode 100644
index 0000000..735788d
--- /dev/null
+++ b/tests/sx-tuto-mktx-stdout.t/TESTRECIPE
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+testname=sx-tuto-mktx-stdout.t
+command=hx
+args=( mktx - --input 97e06e49dfdd26c5a904670971ccf4c7fe7d9da53cb379bf9b442fc9427080b3:1 --output 1MyKMeDsom7rYcp69KpbKn4DcyuvLMkLYJ:90000 )
+exit_code=0
+stdin_file=/dev/null
+stdout_file=stdout
+stderr_file=/dev/null
+sources=( )
+products=( )
+
+# Environment variables:
+env_vars=( )
+
+setup(){
+  : Perform here actions to be run before the tested program
+}
+
+munge(){
+  : Munge here the results of the tested program to ease the check
+}
+
+check(){
+  check_exit_code &&
+  check_stderr &&
+  check_stdout &&
+  check_products &&
+  : Perform here extra checks on the tested program
+}
+
+explain(){
+  explain_exit_code
+  explain_stdout
+  explain_stderr
+  explain_products
+  : Explain here more potential differences
+}
+
+teardown(){
+  : Undo here the actions of setup
+}
diff --git a/tests/sx-tuto-mktx-stdout.t/stdout b/tests/sx-tuto-mktx-stdout.t/stdout
new file mode 100644
index 0000000..e475bbc
--- /dev/null
+++ b/tests/sx-tuto-mktx-stdout.t/stdout
@@ -0,0 +1 @@
+0100000001b3807042c92f449bbf79b33ca59d7dfec7f4cc71096704a9c526dddf496ee0970100000000ffffffff01905f0100000000001976a914e60921dbfe1e066113f1c6e0ea15517234187d4788ac00000000
\ No newline at end of file