diff --git a/src/dobjtype.cpp b/src/dobjtype.cpp
index 1415e15d1e..b27546e33f 100644
--- a/src/dobjtype.cpp
+++ b/src/dobjtype.cpp
@@ -142,7 +142,7 @@ bool PClass::ReadAllFields(FSerializer &ar, void *addr) const
 	if (strcmp(key, "classtype"))
 	{
 		// this does not represent a DObject
-		Printf(TEXTCOLOR_RED "trying to read user variables but got a non-object (first key is '%s')", key);
+		Printf(TEXTCOLOR_RED "trying to read user variables but got a non-object (first key is '%s')\n", key);
 		ar.mErrors++;
 		return false;
 	}
diff --git a/src/g_game.cpp b/src/g_game.cpp
index 97034ada20..1c5388ac17 100644
--- a/src/g_game.cpp
+++ b/src/g_game.cpp
@@ -2591,12 +2591,12 @@ UNSAFE_CCMD (playdemo)
 {
 	if (netgame)
 	{
-		Printf("End your current netgame first!");
+		Printf("End your current netgame first!\n");
 		return;
 	}
 	if (demorecording)
 	{
-		Printf("End your current demo first!");
+		Printf("End your current demo first!\n");
 		return;
 	}
 	if (argv.argc() > 1)
diff --git a/src/g_level.cpp b/src/g_level.cpp
index 2f631db98a..89e9cd678f 100644
--- a/src/g_level.cpp
+++ b/src/g_level.cpp
@@ -241,7 +241,7 @@ UNSAFE_CCMD(recordmap)
 {
 	if (netgame)
 	{
-		Printf("You cannot record a new game while in a netgame.");
+		Printf("You cannot record a new game while in a netgame.\n");
 		return;
 	}
 	if (argv.argc() > 2)
diff --git a/src/gl/compatibility/gl_swshader20.cpp b/src/gl/compatibility/gl_swshader20.cpp
index be965bee9e..8f55ca335f 100644
--- a/src/gl/compatibility/gl_swshader20.cpp
+++ b/src/gl/compatibility/gl_swshader20.cpp
@@ -115,7 +115,7 @@ LegacyShader* LegacyShaderContainer::CreatePixelShader(const FString& vertex, co
 		GLsizei length = 0;
 		buffer[0] = 0;
 		glGetShaderInfoLog(errorShader, 10000, &length, buffer);
-		Printf("Shader compile failed: %s", buffer);
+		Printf("Shader compile failed: %s\n", buffer);
 		delete shader;
 		return nullptr;
 	}
@@ -129,7 +129,7 @@ LegacyShader* LegacyShaderContainer::CreatePixelShader(const FString& vertex, co
 		GLsizei length = 0;
 		buffer[0] = 0;
 		glGetProgramInfoLog(shader->Program, 10000, &length, buffer);
-		Printf("Shader link failed: %s", buffer);
+		Printf("Shader link failed: %s\n", buffer);
 		delete shader;
 		return nullptr;
 	}
diff --git a/src/menu/menu.cpp b/src/menu/menu.cpp
index f95285c51e..742da203a1 100644
--- a/src/menu/menu.cpp
+++ b/src/menu/menu.cpp
@@ -1024,7 +1024,7 @@ CCMD (openmenu)
 {
 	if (argv.argc() < 2)
 	{
-		Printf("Usage: openmenu \"menu_name\"");
+		Printf("Usage: openmenu \"menu_name\"\n");
 		return;
 	}
 	M_StartControlPanel (true);
diff --git a/src/p_conversation.cpp b/src/p_conversation.cpp
index 7dc8292303..cce572976f 100644
--- a/src/p_conversation.cpp
+++ b/src/p_conversation.cpp
@@ -227,7 +227,7 @@ bool LoadScriptFile (const char *name, bool include, int type)
 	{
 		if (type == 0)
 		{
-			Printf(TEXTCOLOR_RED "Could not find dialog file %s", name);
+			Printf(TEXTCOLOR_RED "Could not find dialog file %s\n", name);
 		}
 
 		return false;
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 7a503a62bb..89eae7859c 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -3080,7 +3080,7 @@ void FSlide::SlideTraverse(const DVector2 &start, const DVector2 &end)
 		if (!in->isaline)
 		{
 			// should never happen
-			Printf("PTR_SlideTraverse: not a line?");
+			Printf("PTR_SlideTraverse: not a line?\n");
 			continue;
 		}
 
@@ -3437,7 +3437,7 @@ bool FSlide::BounceTraverse(const DVector2 &start, const DVector2 &end)
 
 		if (!in->isaline)
 		{
-			Printf("PTR_BounceTraverse: not a line?");
+			Printf("PTR_BounceTraverse: not a line?\n");
 			continue;
 		}
 
diff --git a/src/sound/musicformats/music_midistream.cpp b/src/sound/musicformats/music_midistream.cpp
index c52f353398..85c4135de5 100644
--- a/src/sound/musicformats/music_midistream.cpp
+++ b/src/sound/musicformats/music_midistream.cpp
@@ -253,7 +253,7 @@ MIDIDevice *MIDIStreamer::CreateMIDIDevice(EMidiDevice devtype, int samplerate)
 
 			if (devtype == MDEV_DEFAULT)
 			{
-				Printf("Failed to play music: Unable to open any MIDI Device.");
+				Printf("Failed to play music: Unable to open any MIDI Device.\n");
 				return nullptr;
 			}
 		}
@@ -330,7 +330,7 @@ bool MIDIStreamer::DumpWave(const char *filename, int subsong, int samplerate)
 	auto devtype = SelectMIDIDevice(DeviceType);
 	if (devtype == MDEV_MMAPI)
 	{
-		Printf("MMAPI device is not supported");
+		Printf("MMAPI device is not supported\n");
 		return false;
 	}
 	MIDI = CreateMIDIDevice(devtype, samplerate);
diff --git a/src/sound/timidity/timidity.cpp b/src/sound/timidity/timidity.cpp
index ecc46c77f5..e657466c03 100644
--- a/src/sound/timidity/timidity.cpp
+++ b/src/sound/timidity/timidity.cpp
@@ -71,7 +71,7 @@ static bool InitReader(const char *config_file)
 	auto reader = sfmanager.OpenSoundFont(config_file, SF_GUS|SF_SF2);
 	if (reader == nullptr)
 	{
-		Printf(TEXTCOLOR_RED "%s: Unable to load sound font", config_file);
+		Printf(TEXTCOLOR_RED "%s: Unable to load sound font\n", config_file);
 		return false;	// No sound font could be opened.
 	}
 	gus_sfreader.reset(reader);
diff --git a/src/textures/formats/multipatchtexture.cpp b/src/textures/formats/multipatchtexture.cpp
index bc8b7cea2c..af15077c6b 100644
--- a/src/textures/formats/multipatchtexture.cpp
+++ b/src/textures/formats/multipatchtexture.cpp
@@ -740,7 +740,7 @@ void FTextureManager::AddTexturesLump (const void *lumpdata, int lumpsize, int d
 		// Check whether the amount of names reported is correct.
 		if ((signed)numpatches < 0)
 		{
-			Printf("Corrupt PNAMES lump found (negative amount of entries reported)");
+			Printf("Corrupt PNAMES lump found (negative amount of entries reported)\n");
 			return;
 		}
 
@@ -778,7 +778,7 @@ void FTextureManager::AddTexturesLump (const void *lumpdata, int lumpsize, int d
 
 	if (maxoff < uint32_t(numtextures+1)*4)
 	{
-		Printf ("Texture directory is too short");
+		Printf ("Texture directory is too short\n");
 		delete[] patchlookup;
 		return;
 	}
@@ -789,7 +789,7 @@ void FTextureManager::AddTexturesLump (const void *lumpdata, int lumpsize, int d
 		offset = LittleLong(directory[i]);
 		if (offset > maxoff)
 		{
-			Printf ("Bad texture directory");
+			Printf ("Bad texture directory\n");
 			delete[] patchlookup;
 			return;
 		}
@@ -825,7 +825,7 @@ void FTextureManager::AddTexturesLump (const void *lumpdata, int lumpsize, int d
 		offset = LittleLong(directory[i]);
 		if (offset > maxoff)
 		{
-			Printf ("Bad texture directory");
+			Printf ("Bad texture directory\n");
 			delete[] patchlookup;
 			return;
 		}
diff --git a/src/win32/i_input.cpp b/src/win32/i_input.cpp
index 4234868c70..85bc3abef5 100644
--- a/src/win32/i_input.cpp
+++ b/src/win32/i_input.cpp
@@ -644,7 +644,7 @@ bool I_InitInput (void *hwnd)
 			hr = di8c(g_hInst, DIRECTINPUT_VERSION, IID_IDirectInput8A, (void **)&g_pdi, NULL);
 			if (FAILED(hr))
 			{
-				Printf(TEXTCOLOR_ORANGE "DirectInput8Create failed: %08lx", hr);
+				Printf(TEXTCOLOR_ORANGE "DirectInput8Create failed: %08lx\n", hr);
 				g_pdi = NULL;	// Just to be sure DirectInput8Create didn't change it
 			}
 		}