diff --git a/ivtest/perl-lib/Environment.pm b/ivtest/perl-lib/Environment.pm
index a348e91cc..f5103744b 100644
--- a/ivtest/perl-lib/Environment.pm
+++ b/ivtest/perl-lib/Environment.pm
@@ -91,14 +91,15 @@ sub get_regress_fn {
 #
 sub get_ivl_version {
     my $sfx = shift(@_);
-    if (`iverilog$sfx -V` =~ /^Icarus Verilog version (\d+)\.(\d+)/) {
+    my $cmd = "iverilog$sfx -V";
+    if (`$cmd` =~ /^Icarus Verilog version (\d+)\.(\d+)/) {
         if ($1 == 0) {
             return $1.".".$2;
         } else {
             return $1;
         }
     } else {
-        die "Failed to get version from iverilog$sfx -V output";
+        die "Failed to get version from '$cmd' output";
     }
 }