diff --git a/core/build.xml b/core/build.xml
index d4dee9e3d..46913dbd0 100644
--- a/core/build.xml
+++ b/core/build.xml
@@ -218,7 +218,7 @@
 	<!-- CHECK TODOs -->
 	<target name="todo" depends="checktodo"/>
 	<target name="checktodo">
-		<tempfile property="todo.file" prefix="${tmp.dir}/checktodo-"/>
+		<tempfile property="todo.file" prefix="checktodo-" destDir="${tmp.dir}"/>
 		<echo>Checking project for FIXMEs.</echo>
 		<concat destfile="${todo.file}">
 			<fileset dir="${src.dir}">
@@ -244,7 +244,7 @@ ${criticaltodos}</fail>
 	<!-- CHECK ASCII -->
 	<target name="ascii" depends="checkascii"/>
 	<target name="checkascii">
-		<tempfile property="ascii.file" prefix="${tmp.dir}/checkascii-"/>
+		<tempfile property="ascii.file" prefix="checkascii-" destDir="${tmp.dir}"/>
 		<echo>Checking project for non-ASCII characters.</echo>
 		<concat destfile="${ascii.file}">
 			<fileset dir="${src.dir}">