diff --git a/Common/Vulkan/VulkanContext.cpp b/Common/Vulkan/VulkanContext.cpp
index a949a836fd..fb92fb5791 100644
--- a/Common/Vulkan/VulkanContext.cpp
+++ b/Common/Vulkan/VulkanContext.cpp
@@ -27,8 +27,6 @@
 #define new DBG_NEW
 #endif
 
-using namespace std;
-
 static const char *validationLayers[] = {
 	"VK_LAYER_LUNARG_standard_validation",
 	/*
diff --git a/Core/MIPS/x86/CompReplace.cpp b/Core/MIPS/x86/CompReplace.cpp
index 336a38264e..b6ac76a439 100644
--- a/Core/MIPS/x86/CompReplace.cpp
+++ b/Core/MIPS/x86/CompReplace.cpp
@@ -27,7 +27,7 @@ using namespace Gen;
 
 int Jit::Replace_fabsf() {
 	fpr.SpillLock(0, 12);
-	fpr.MapReg(0, MAP_DIRTY | MAP_NOINIT);
+	fpr.MapReg(0, false, true);
 	MOVSS(fpr.RX(0), fpr.R(12));
 	ANDPS(fpr.RX(0), M(&ssNoSignMask));
 	fpr.ReleaseSpillLocks();
diff --git a/UI/DisplayLayoutScreen.cpp b/UI/DisplayLayoutScreen.cpp
index 0447aaeacf..0154567b9d 100644
--- a/UI/DisplayLayoutScreen.cpp
+++ b/UI/DisplayLayoutScreen.cpp
@@ -31,7 +31,7 @@
 #include "GPU/GLES/Framebuffer.h"
 
 static const int leftColumnWidth = 200;
-static const float orgRatio = 1.764706;
+static const float orgRatio = 1.764706f;
 
 // Ugly hackery, need to rework some stuff to get around this
 static float local_dp_xres;
diff --git a/UI/GameSettingsScreen.cpp b/UI/GameSettingsScreen.cpp
index 32c4a1f93b..6a5c49415d 100644
--- a/UI/GameSettingsScreen.cpp
+++ b/UI/GameSettingsScreen.cpp
@@ -58,7 +58,6 @@
 #include "util/text/utf8.h"
 #include "Windows/W32Util/ShellUtil.h"
 #include "Windows/W32Util/Misc.h"
-using namespace std;
 
 #endif
 
@@ -729,7 +728,7 @@ UI::EventReturn GameSettingsScreen::OnSavePathMydoc(UI::EventParams &e) {
 		g_Config.memStickDirectory = PPSSPPpath + "memstick/";
 	}
 	else {
-		ofstream myfile;
+		std::ofstream myfile;
 		myfile.open(PPSSPPpath + "installed.txt");
 		if (myfile.is_open()){
 			myfile.close();
diff --git a/ext/native/base/basictypes.h b/ext/native/base/basictypes.h
index c7cb845a99..f095ffe43c 100644
--- a/ext/native/base/basictypes.h
+++ b/ext/native/base/basictypes.h
@@ -6,7 +6,6 @@
 #ifdef _WIN32
 #pragma warning(disable:4244)
 #pragma warning(disable:4996)
-#pragma warning(disable:4305)  // truncation from double to float
 #endif
 
 #define DISALLOW_COPY_AND_ASSIGN(t) \
diff --git a/unittest/UnitTest.cpp b/unittest/UnitTest.cpp
index f1716ab2bd..715525a672 100644
--- a/unittest/UnitTest.cpp
+++ b/unittest/UnitTest.cpp
@@ -202,7 +202,7 @@ void fcs2(float theta, float &outsine, float &outcosine) {
 
 	float x = 2 * gamma - gamma * fabs(gamma);
 	float y = 2 * theta - theta * fabs(theta);
-	const float P = 0.225;
+	const float P = 0.225f;
 	outsine = P * (y * fabsf(y) - y) + y;   // Q * y + P * y * abs(y)
 	outcosine = P * (x * fabsf(x) - x) + x;   // Q * y + P * y * abs(y)
 }