diff --git a/Include/httpClient/pal.h b/Include/httpClient/pal.h
index cb092f20..28e0d5ab 100644
--- a/Include/httpClient/pal.h
+++ b/Include/httpClient/pal.h
@@ -18,7 +18,7 @@
 
 #include <httpClient/config.h>
 
-#if _WIN32
+#if defined(_WIN32)
 
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
diff --git a/Source/Common/utils.h b/Source/Common/utils.h
index 7dcc7d06..6d994211 100644
--- a/Source/Common/utils.h
+++ b/Source/Common/utils.h
@@ -183,7 +183,7 @@ class hc_task : public std::enable_shared_from_this<hc_task>
 
 static inline int str_icmp(const http_internal_string& left, const http_internal_string& right)
 {
-#if _WIN32
+#if defined(_WIN32)
     return _stricmp(left.c_str(), right.c_str());
 #else
     return strcasecmp(left.c_str(), right.c_str());