diff --git a/tools/quartus/run_regtest_synth b/tools/quartus/run_regtest_synth
index b0bfbf3096157994d9e008137821e89abcc29c82..d69e5be7183ec2ef0ce10b7e08ebd7f32621fdae 100755
--- a/tools/quartus/run_regtest_synth
+++ b/tools/quartus/run_regtest_synth
@@ -99,7 +99,7 @@ NOF_RBF_REQ=1
 FOUND_RBF=$(find ${RADIOHDL}/build/ -name *.rbf | grep "\-r")
 NOF_RBF=$(echo ${FOUND_RBF} | grep -c "rbf")
 RESULT=FAILED
-if (( NOF_RBF = NOF_RBF_REQ )); then
+if (( NOF_RBF == NOF_RBF_REQ )); then
   RESULT=PASSED
 fi