diff --git a/src/nodebuild.cpp b/src/nodebuild.cpp
index 90aaff492..83393f7c3 100644
--- a/src/nodebuild.cpp
+++ b/src/nodebuild.cpp
@@ -789,7 +789,7 @@ void FNodeBuilder::SplitSegs (DWORD set, node_t &node, DWORD splitseg, DWORD &ou
 			newvert.y += fixed_t(frac * double(Vertices[seg->v2].y - newvert.y));
 			vertnum = VertexMap->SelectVertexClose (newvert);
 
-			if (vertnum == seg->v1 || vertnum == seg->v2)
+			if (vertnum == (unsigned int)seg->v1 || vertnum == (unsigned int)seg->v2)
 			{
 				Printf("SelectVertexClose selected endpoint of seg %u\n", set);
 			}
diff --git a/src/textures/ddstexture.cpp b/src/textures/ddstexture.cpp
index ab5b4505d..da9ec5955 100644
--- a/src/textures/ddstexture.cpp
+++ b/src/textures/ddstexture.cpp
@@ -769,7 +769,7 @@ void FDDSTexture::DecompressDXT5 (FWadLump &lump, bool premultiplied, BYTE *tcbu
 	BYTE *block;
 	PalEntry color[4];
 	BYTE palcol[4];
-	DWORD yalphaslice;
+	DWORD yalphaslice = 0;
 	int ox, oy, x, y, i;
 
 	for (oy = 0; oy < Height; oy += 4)
diff --git a/src/v_text.cpp b/src/v_text.cpp
index 715e06093..55dbcc774 100644
--- a/src/v_text.cpp
+++ b/src/v_text.cpp
@@ -317,7 +317,8 @@ FBrokenLines *V_BreakLines (FFont *font, int maxwidth, const BYTE *string)
 	FBrokenLines lines[128];	// Support up to 128 lines (should be plenty)
 
 	const BYTE *space = NULL, *start = string;
-	int i, c, w, nw;
+	size_t i, ii;
+	int c, w, nw;
 	FString lastcolor, linecolor;
 	bool lastWasSpace = false;
 	int kerning = font->GetDefaultKerning ();
@@ -418,11 +419,11 @@ FBrokenLines *V_BreakLines (FFont *font, int maxwidth, const BYTE *string)
 	// Make a copy of the broken lines and return them
 	FBrokenLines *broken = new FBrokenLines[i+1];
 
-	for (c = 0; c < i; ++c)
+	for (ii = 0; ii < i; ++ii)
 	{
-		broken[c] = lines[c];
+		broken[ii] = lines[ii];
 	}
-	broken[c].Width = -1;
+	broken[ii].Width = -1;
 
 	return broken;
 }