diff --git a/utils/environment.sh b/utils/environment.sh
index 6706ed57..eb6ee049 100644
--- a/utils/environment.sh
+++ b/utils/environment.sh
@@ -33,3 +33,14 @@ export XRAY_BLOCKWIDTH="python3 ${XRAY_UTILS_DIR}/blockwidth.py"
 export XRAY_PARSEDB="python3 ${XRAY_UTILS_DIR}/parsedb.py"
 export XRAY_TCL_REFORMAT="${XRAY_UTILS_DIR}/tcl-reformat.sh"
 export XRAY_VIVADO="${XRAY_UTILS_DIR}/vivado.sh"
+
+# Verify an approved version is in use
+export XRAY_VIVADO_SETTINGS="${XRAY_VIVADO_SETTINGS:-/opt/Xilinx/Vivado/2017.2/settings64.sh}"
+# Vivado v2017.2 (64-bit)
+if [ $(${XRAY_VIVADO} -h |grep Vivado |cut -d\  -f 2) != "v2017.2" ] ; then
+    echo "Requires Vivado 2017.2. See https://github.com/SymbiFlow/prjxray/issues/14"
+    # Can't exit since sourced script
+    # Trash a key environment variable to preclude use
+    export XRAY_DIR="/bad/vivado/version"
+    return
+fi
diff --git a/utils/vivado.sh b/utils/vivado.sh
index 810314e3..beb09e0c 100755
--- a/utils/vivado.sh
+++ b/utils/vivado.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
 
-source "${XRAY_VIVADO_SETTINGS:-/opt/Xilinx/Vivado/2017.2/settings64.sh}"
+source "${XRAY_VIVADO_SETTINGS}"
 
 vivado "$@"