diff --git a/tests/tools/vcs/basic/work.1.f b/tests/tools/vcs/basic/work.1.f
index 6b8bfe16..7d4badd6 100644
--- a/tests/tools/vcs/basic/work.1.f
+++ b/tests/tools/vcs/basic/work.1.f
@@ -1 +1 @@
--sverilog a few vlogan options +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str="hello" +incdir+.
+-sverilog a few vlogan options +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str=""hello"" +incdir+.
diff --git a/tests/tools/vcs/basic/work.2.f b/tests/tools/vcs/basic/work.2.f
index 2bd05b8e..1bdc1d02 100644
--- a/tests/tools/vcs/basic/work.2.f
+++ b/tests/tools/vcs/basic/work.2.f
@@ -1 +1 @@
--sverilog a few vlogan options +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str="hello" +define+FD_KEY="FD_VAL" +incdir+.
+-sverilog a few vlogan options +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str=""hello"" +define+FD_KEY=""FD_VAL"" +incdir+.
diff --git a/tests/tools/vcs/minimal/work.1.f b/tests/tools/vcs/minimal/work.1.f
index 32de5611..f1e48733 100644
--- a/tests/tools/vcs/minimal/work.1.f
+++ b/tests/tools/vcs/minimal/work.1.f
@@ -1 +1 @@
--sverilog +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str="hello" +incdir+.
+-sverilog +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str=""hello"" +incdir+.
diff --git a/tests/tools/vcs/minimal/work.2.f b/tests/tools/vcs/minimal/work.2.f
index 449a2d93..8b1da4fe 100644
--- a/tests/tools/vcs/minimal/work.2.f
+++ b/tests/tools/vcs/minimal/work.2.f
@@ -1 +1 @@
--sverilog +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str="hello" +define+FD_KEY="FD_VAL" +incdir+.
+-sverilog +define+vlogdefine_bool=1 +define+vlogdefine_int=42 +define+vlogdefine_str=""hello"" +define+FD_KEY=""FD_VAL"" +incdir+.