diff --git a/lttoolbox/fst_processor.cc b/lttoolbox/fst_processor.cc
index a370474e..846ffd1b 100644
--- a/lttoolbox/fst_processor.cc
+++ b/lttoolbox/fst_processor.cc
@@ -383,7 +383,7 @@ FSTProcessor::readTMAnalysis(InputFile& input)
   return val;
 }
 
-int
+int32_t
 FSTProcessor::readPostgeneration(InputFile& input, UFILE *output)
 {
   if(!input_buffer.isEmpty())
@@ -903,7 +903,7 @@ FSTProcessor::lastBlank(UString const &str)
 }
 
 void
-FSTProcessor::printSpace(UChar const val, UFILE *output)
+FSTProcessor::printSpace(UChar32 const val, UFILE *output)
 {
   if(blankqueue.size() > 0)
   {
@@ -1803,7 +1803,7 @@ FSTProcessor::postgeneration(InputFile& input, UFILE *output)
   int last = 0;
   set<UChar32> empty_escaped_chars;
 
-  while(UChar val = readPostgeneration(input, output))
+  while(UChar32 val = readPostgeneration(input, output))
   {
     if(val == '~')
     {
@@ -2027,7 +2027,7 @@ FSTProcessor::intergeneration(InputFile& input, UFILE *output)
 
   while (true)
   {
-    UChar val = readPostgeneration(input, output);
+    UChar32 val = readPostgeneration(input, output);
 
     if (val == '~')
     {
@@ -2165,7 +2165,7 @@ FSTProcessor::transliteration(InputFile& input, UFILE *output)
   UString sf;
   int last = 0;
 
-  while(UChar val = readPostgeneration(input, output))
+  while(UChar32 val = readPostgeneration(input, output))
   {
     if(u_ispunct(val) || u_isspace(val))
     {
diff --git a/lttoolbox/fst_processor.h b/lttoolbox/fst_processor.h
index 04cc68a0..7cde42e1 100644
--- a/lttoolbox/fst_processor.h
+++ b/lttoolbox/fst_processor.h
@@ -452,7 +452,7 @@ class FSTProcessor
    * @param val the space character to use if no blank queue
    * @param output stream where the word is written
    */
-  void printSpace(UChar const val, UFILE *output);
+  void printSpace(UChar32 const val, UFILE *output);
 
   void skipUntil(InputFile& input, UFILE *output, UChar32 const character);
   static UString removeTags(UString const &str);
diff --git a/tests/lt_proc/__init__.py b/tests/lt_proc/__init__.py
index 7de96a52..22cf1794 100644
--- a/tests/lt_proc/__init__.py
+++ b/tests/lt_proc/__init__.py
@@ -254,5 +254,12 @@ class AlphabeticMultibyteTest(ProcTest):
     expectedOutputs = ["^𝜊/*𝜊$"]
 
 
+class AlphabeticMultibyteTestPost(ProcTest):
+    procdix = "data/minimal-mono.dix"
+    inputs = ["𝜊"]  # code point >65535, needs two bytes in utf-8, isAlphabetic
+    procflags = ['-z', '-p']
+    expectedOutputs = ["𝜊"]
+
+
 # These fail on some systems:
 #from null_flush_invalid_stream_format import *