diff --git a/lib/scripts/lyxpreview2bitmap.sh b/lib/scripts/lyxpreview2bitmap.sh
index dfcd7e9991..3efc75408c 100644
--- a/lib/scripts/lyxpreview2bitmap.sh
+++ b/lib/scripts/lyxpreview2bitmap.sh
@@ -94,6 +94,11 @@ if [ $# -ne 3 ]; then
 	exit 1
 fi
 
+# We use latex, dvips and gs, so check that they're all there.
+FIND_IT ${LATEX}
+FIND_IT ${DVIPS}
+FIND_IT ${GS}
+
 # Extract the params from the argument list.
 DIR=`dirname $1`
 BASE=`basename $1 .tex`
@@ -111,11 +116,6 @@ else
 	Expected either \"ppm\" or \"png\"."
 fi
 
-# We use latex, dvips and gs, so check that they're all there.
-FIND_IT ${LATEX}
-FIND_IT ${DVIPS}
-FIND_IT ${GS}
-
 # Initialise some variables.
 TEXFILE=${BASE}.tex
 LOGFILE=${BASE}.log