diff --git a/diamond.sh b/diamond.sh
index 6a69b2e..d54ee31 100755
--- a/diamond.sh
+++ b/diamond.sh
@@ -58,7 +58,7 @@
 else
 	export LD_LIBRARY_PATH="${bindir}:${fpgabindir}"
 fi
-export LM_LICENSE_FILE="${diamonddir}/license/license.dat"
+export LM_LICENSE_FILE="${LM_LICENSE_FILE:=${diamonddir}/license/license.dat}"
 
 set -ex
 if [[ $2 == *.ncl ]]
diff --git a/diamond_tcl.sh b/diamond_tcl.sh
index 0bbb4f6..36db79e 100755
--- a/diamond_tcl.sh
+++ b/diamond_tcl.sh
@@ -41,7 +41,7 @@
 else
 	export LD_LIBRARY_PATH="${bindir}:${fpgabindir}"
 fi
-export LM_LICENSE_FILE="${diamonddir}/license/license.dat"
+export LM_LICENSE_FILE="${LM_LICENSE_FILE:=${diamonddir}/license/license.dat}"
 
 if $WINDOWS; then
     $FOUNDRY/userware/NT/bin/nt64/ispTcl $1