diff --git a/Makesurefile b/Makesurefile
index 69ad34c..7f64441 100644
--- a/Makesurefile
+++ b/Makesurefile
@@ -4,7 +4,7 @@
 @define NEXT_VERSION   '0.9.21'
 @define GOAWK_VERSION  '1.23.1'
 @define JUST_VERSION   '1.3.0'
-@define FHTAGN_VERSION 'v0.1.0'
+@define FHTAGN_VERSION '382e522'
 @define GOAWK "goawk$GOAWK_VERSION"
 @define JUST "just$JUST_VERSION"
 @define FHTAGN_URL "https://github.com/xonixx/fhtagn/raw/$FHTAGN_VERSION/fhtagn.awk"
@@ -70,6 +70,7 @@
 
     export NEXT_VERSION
 
+    [[ "$OSTYPE" == "linux-gnu"* ]] && [[ -d /dev/shm ]] && export TMPDIR="/dev/shm"
     if "$FHTAGN" "$f"
     then
       echo "TESTS PASSED : $f"
@@ -86,6 +87,7 @@
 @goal fhtagn
 @doc 'runs all *.tush tests (fail at end)'
 @depends_on prepared4tests
+  [[ "$OSTYPE" == "linux-gnu"* ]] && [[ -d /dev/shm ]] && export TMPDIR="/dev/shm"
   MAKESURE=makesure_dev ALL=1 "$FHTAGN" tests/*.tush
 
 @goal @glob 'tests/*.tush' @private