2 files changed, 3 insertions, 3 deletions
diff --git a/c/main.cpp b/c/main.cpp
index 7937b50..6865e4c 100644
--- a/c/main.cpp
+++ b/c/main.cpp
@@ -69,9 +69,9 @@ void OnTerminate() noexcept
 			TerminateMsg<TCHAR>(TEXT("a Prolog exception"), tsz);
 		else
 			TerminateMsg<char>("a Prolog exception", NULL);
-	} catch (Win32Error& e) {
+	} catch (const Win32Error& e) {
 		TerminateMsg<TCHAR>(TEXT("a Windows error"), e.what<TCHAR>());
-	} catch (std::exception& e) {
+	} catch (const std::exception& e) {
 		TerminateMsg<char>("an exception", e.what());
 	} catch (...) {
 		TerminateMsg<char>("an exception", NULL);
diff --git a/c/pl.h b/c/pl.h
index 44b8a5e..d1c01c4 100644
--- a/c/pl.h
+++ b/c/pl.h
@@ -111,7 +111,7 @@ int Pl(const char* const szMod, const char* const szPred, T... xs)
 {
 	try {
 		return Plx(szMod, szPred, xs...);
-	} catch (term_t& t) {
+	} catch (const term_t& t) {
 		return 0;
 	}
 }