diff --git a/include/dwarfs/conv.h b/include/dwarfs/conv.h
index dafe9572..da4baf8a 100644
--- a/include/dwarfs/conv.h
+++ b/include/dwarfs/conv.h
@@ -77,7 +77,7 @@ std::optional<bool> try_to(std::string_view s)
 
 template <typename T, typename U>
 std::optional<T> try_to(U&& s)
-  requires(std::convertible_to<U, T>)
+  requires(!std::same_as<T, bool> && std::convertible_to<U, T>)
 {
   return std::forward<U>(s);
 }
diff --git a/test/utils_test.cpp b/test/utils_test.cpp
index 06e0cc0b..ca5153e1 100644
--- a/test/utils_test.cpp
+++ b/test/utils_test.cpp
@@ -29,6 +29,8 @@
 #include <tuple>
 #include <vector>
 
+#include <folly/portability/Stdlib.h>
+
 #include <dwarfs/error.h>
 #include <dwarfs/util.h>
 
@@ -390,3 +392,34 @@ TEST(utils, parse_time_point) {
               ::testing::ThrowsMessage<dwarfs::runtime_error>(
                   ::testing::HasSubstr("cannot parse time point")));
 }
+
+TEST(utils, getenv_is_enabled) {
+  static char const* const test_var = "_DWARFS_THIS_IS_A_TEST_";
+
+  EXPECT_EQ(0, unsetenv("_DWARFS_THIS_IS_A_TEST_"));
+  EXPECT_FALSE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, setenv(test_var, "0", 1));
+  EXPECT_FALSE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, setenv(test_var, "1", 1));
+  EXPECT_TRUE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, setenv(test_var, "false", 1));
+  EXPECT_FALSE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, setenv(test_var, "true", 1));
+  EXPECT_TRUE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, setenv(test_var, "off", 1));
+  EXPECT_FALSE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, setenv(test_var, "on", 1));
+  EXPECT_TRUE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, setenv(test_var, "ThisAintBool", 1));
+  EXPECT_FALSE(getenv_is_enabled(test_var));
+
+  EXPECT_EQ(0, unsetenv(test_var));
+  EXPECT_FALSE(getenv_is_enabled(test_var));
+}