diff --git a/doctest/doctest.h b/doctest/doctest.h
index 64a78d7..cf3103f 100644
--- a/doctest/doctest.h
+++ b/doctest/doctest.h
@@ -1184,7 +1184,7 @@
                 , m_at(at) {}
 
         DOCTEST_NOINLINE operator Result() {
-            bool res = !!lhs;
+            bool res = static_cast<bool>(lhs);
             if(m_at & assertType::is_false) //!OCLINT bitwise operator in conditional
                 res = !res;
 
@@ -6088,7 +6088,7 @@
 #define DOCTEST_PARSE_AS_BOOL_OR_FLAG(name, sname, var, default)                                   \
     if(parseIntOption(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX name "=", option_bool, intRes) ||  \
        parseIntOption(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX sname "=", option_bool, intRes))   \
-        p->var = !!intRes;                                                                         \
+        p->var = static_cast<bool>(intRes);                                                        \
     else if(parseFlag(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX name) ||                           \
             parseFlag(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX sname))                            \
         p->var = true;                                                                             \
diff --git a/doctest/parts/doctest.cpp b/doctest/parts/doctest.cpp
index 986dce4..9da6a97 100644
--- a/doctest/parts/doctest.cpp
+++ b/doctest/parts/doctest.cpp
@@ -3421,7 +3421,7 @@
 #define DOCTEST_PARSE_AS_BOOL_OR_FLAG(name, sname, var, default)                                   \
     if(parseIntOption(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX name "=", option_bool, intRes) ||  \
        parseIntOption(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX sname "=", option_bool, intRes))   \
-        p->var = !!intRes;                                                                         \
+        p->var = static_cast<bool>(intRes);                                                        \
     else if(parseFlag(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX name) ||                           \
             parseFlag(argc, argv, DOCTEST_CONFIG_OPTIONS_PREFIX sname))                            \
         p->var = true;                                                                             \
diff --git a/doctest/parts/doctest_fwd.h b/doctest/parts/doctest_fwd.h
index 2b926a0..2a9805b 100644
--- a/doctest/parts/doctest_fwd.h
+++ b/doctest/parts/doctest_fwd.h
@@ -1181,7 +1181,7 @@
                 , m_at(at) {}
 
         DOCTEST_NOINLINE operator Result() {
-            bool res = !!lhs;
+            bool res = static_cast<bool>(lhs);
             if(m_at & assertType::is_false) //!OCLINT bitwise operator in conditional
                 res = !res;