diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1751ec2..75705fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,6 +28,8 @@ add_executable(${PROJECT_NAME} WIN32
 
 find_package(OpenSSL REQUIRED)
 
+set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DDEBUG")
+
 target_link_libraries(${PROJECT_NAME}
     OpenSSL::SSL
     Wtsapi32.lib
diff --git a/as.c b/as.c
index 0612fcd..eac771b 100644
--- a/as.c
+++ b/as.c
@@ -336,6 +336,7 @@ again:
     /* handle cert errors */
     /* https://www.betaarchive.com/wiki/index.php/Microsoft_KB_Archive/182888 */
     if (!HttpSendRequestW(hRequest, NULL, 0, NULL, 0)) {
+#ifdef DEBUG
         DWORD err = GetLastError();
         if ((err == ERROR_INTERNET_INVALID_CA) ||
             (err == ERROR_INTERNET_SEC_CERT_CN_INVALID) ||
@@ -369,7 +370,7 @@ again:
             else
                 goto done;
         }
-
+#endif
         ShowWinInetError(hWnd);
         goto done;
     }