diff --git a/Makefile.am b/Makefile.am
index 567bc82c..7fc3c5a3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -140,6 +140,7 @@ src_libespeak_ng_la_SOURCES = \
 	src/ucd-tools/src/case.c \
 	src/ucd-tools/src/categories.c \
 	src/ucd-tools/src/ctype.c \
+	src/ucd-tools/src/proplist.c \
 	src/ucd-tools/src/scripts.c \
 	src/ucd-tools/src/tostring.c \
 	src/libespeak-ng/compiledata.c \
diff --git a/src/windows/libespeak-ng.vcxproj b/src/windows/libespeak-ng.vcxproj
index f9971eb7..f2da6985 100644
--- a/src/windows/libespeak-ng.vcxproj
+++ b/src/windows/libespeak-ng.vcxproj
@@ -161,6 +161,7 @@
     <ClCompile Include="..\ucd-tools\src\case.c" />
     <ClCompile Include="..\ucd-tools\src\categories.c" />
     <ClCompile Include="..\ucd-tools\src\ctype.c" />
+    <ClCompile Include="..\ucd-tools\src\proplist.c" />
     <ClCompile Include="..\ucd-tools\src\scripts.c" />
     <ClCompile Include="..\ucd-tools\src\tostring.c" />
     <ClCompile Include="..\libespeak-ng\compiledata.c" />