diff --git a/src/lua_blockmaplib.c b/src/lua_blockmaplib.c
index d90ef4d67..ccd90f993 100644
--- a/src/lua_blockmaplib.c
+++ b/src/lua_blockmaplib.c
@@ -266,4 +266,4 @@ int LUA_BlockmapLib(lua_State *L)
 	return 0;
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/m_menu.c b/src/m_menu.c
index c3d140d91..cde2ae902 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -367,6 +367,7 @@ static void M_DrawMainVideoMenu(void);
 static void M_DrawVideoMode(void);
 static void M_DrawColorMenu(void);
 static void M_DrawSoundMenu(void);
+static void M_DrawScreenshotMenu(void);
 static void M_DrawMonitorToggles(void);
 #ifdef HWRENDER
 static void M_OGL_DrawFogMenu(void);
diff --git a/src/p_floor.c b/src/p_floor.c
index cefdc3d4f..68c3d55b8 100644
--- a/src/p_floor.c
+++ b/src/p_floor.c
@@ -2929,7 +2929,7 @@ void EV_CrumbleChain(sector_t *sec, ffloor_t *rover)
 	fixed_t leftx, rightx;
 	fixed_t topy, bottomy;
 	fixed_t topz, bottomz;
-	fixed_t widthfactor, heightfactor;
+	fixed_t widthfactor = FRACUNIT, heightfactor = FRACUNIT;
 	fixed_t a, b, c;
 	mobjtype_t type = MT_ROCKCRUMBLE1;
 	fixed_t spacing = (32<<FRACBITS);
diff --git a/src/s_sound.c b/src/s_sound.c
index b8cb06075..2f3b1ae93 100644
--- a/src/s_sound.c
+++ b/src/s_sound.c
@@ -406,14 +406,14 @@ void S_StopSoundByNum(sfxenum_t sfxnum)
 void S_StartCaption(sfxenum_t sfx_id, INT32 cnum, UINT16 lifespan)
 {
 	UINT8 i, set, moveup, start;
-	boolean same;
+	boolean same = false;
 	sfxinfo_t *sfx;
 
 	if (!cv_closedcaptioning.value) // no captions at all
 		return;
 
 	// check for bogus sound #
-	I_Assert(sfx_id >= 0); // allows sfx_None; this shouldn't be allowed directly if S_StartCaption is ever exposed to Lua by itself
+	// I_Assert(sfx_id >= 0); -- allowing sfx_None; this shouldn't be allowed directly if S_StartCaption is ever exposed to Lua by itself
 	I_Assert(sfx_id < NUMSFX);
 
 	sfx = &S_sfx[sfx_id];