diff --git a/CMakeLists.txt b/CMakeLists.txt
index 32551c602..5dc1e38c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,8 +34,8 @@ if(NOT MSVC)
 		# mingw32 likes to complain about using the "wrong" format strings despite them actually working
 		set(WARNING_FLAGS "${WARNING_FLAGS} -Wno-format")
 	endif()
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS} -Werror=implicit-function-declaration -Werror=implicit-int")
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS}")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS} -Werror=implicit-function-declaration -Werror=missing-parameter-type -Werror=implicit-int")
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS} -Woverloaded-virtual")
 else()
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_CRT_SECURE_NO_WARNINGS /wd4003 /wd4244 /wd4146 /wd4267 /Zc:preprocessor-")
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_CRT_SECURE_NO_WARNINGS /wd4003 /wd4244 /wd4146 /wd4267 /Zc:preprocessor-")
diff --git a/src/platform/qt/ConfigController.cpp b/src/platform/qt/ConfigController.cpp
index 1116dba79..73097df09 100644
--- a/src/platform/qt/ConfigController.cpp
+++ b/src/platform/qt/ConfigController.cpp
@@ -343,6 +343,7 @@ constexpr const char* ConfigController::mruName(ConfigController::MRU mru) {
 	case MRU::Script:
 		return "recentScripts";
 	}
+	Q_UNREACHABLE();
 }
 
 void ConfigController::write() {
diff --git a/src/platform/qt/MemorySearch.cpp b/src/platform/qt/MemorySearch.cpp
index 8589f9cfe..f61fb9e52 100644
--- a/src/platform/qt/MemorySearch.cpp
+++ b/src/platform/qt/MemorySearch.cpp
@@ -178,7 +178,7 @@ void MemorySearch::refresh() {
 		mCoreMemorySearchResult* result = mCoreMemorySearchResultsGetPointer(&m_results, i);
 		QTableWidgetItem* item = new QTableWidgetItem(QString("%1").arg(result->address, 8, 16, QChar('0')));
 		m_ui.results->setItem(i, 0, item);
-		QTableWidgetItem* type;
+		QTableWidgetItem* type = nullptr;
 		QByteArray string;
 		if (result->type == mCORE_MEMORY_SEARCH_INT && m_ui.numHex->isChecked()) {
 			switch (result->width) {
@@ -213,7 +213,12 @@ void MemorySearch::refresh() {
 					string.append(core->rawRead8(core, result->address + i, result->segment));
 				}
 				item = new QTableWidgetItem(QLatin1String(string)); // TODO
+				break;
+			case mCORE_MEMORY_SEARCH_GUESS:
+				item = nullptr;
+				break;
 			}
+			Q_ASSERT(item);
 		}
 		QString divisor;
 		if (result->guessDivisor > 1) {
@@ -231,7 +236,12 @@ void MemorySearch::refresh() {
 			break;
 		case mCORE_MEMORY_SEARCH_STRING:
 			type = new QTableWidgetItem("string");
+			break;
+		case mCORE_MEMORY_SEARCH_GUESS:
+			break;
 		}
+		Q_ASSERT(type);
+
 		m_ui.results->setItem(i, 1, item);
 		m_ui.results->setItem(i, 2, type);
 		m_ui.opDelta->setEnabled(true);