diff --git a/src/d_dehacked.cpp b/src/d_dehacked.cpp
index 6be9b8538..f63978190 100644
--- a/src/d_dehacked.cpp
+++ b/src/d_dehacked.cpp
@@ -1602,7 +1602,7 @@ static void SetPointer(FState *state, PSymbol *sym, int frame = 0)
 	}
 	else
 	{
-		FString symname = sym->SymbolName;
+		FString symname = sym->SymbolName.GetChars();
 		state->SetAction(static_cast<PSymbolActionFunction*>(sym));
 
 		// Note: CompareNoCase() calls stricmp() and therefore returns 0 when they're the same.
diff --git a/src/p_3dfloors.cpp b/src/p_3dfloors.cpp
index fb641ccb8..29b3295e0 100644
--- a/src/p_3dfloors.cpp
+++ b/src/p_3dfloors.cpp
@@ -178,8 +178,8 @@ static int P_Set3DFloor(line_t * line, int param,int param2, int alpha)
 
 						l->frontsector->ColorMap = 
 							GetSpecialLights (l->frontsector->ColorMap->Color, 
-											  vavoomcolors[l->args[0]]&VC_COLORMASK, 
-											  (vavoomcolors[l->args[0]]&VC_ALPHAMASK)>>24);
+											  (unsigned int)(vavoomcolors[l->args[0]]&VC_COLORMASK), 
+											  (unsigned int)(vavoomcolors[l->args[0]]&VC_ALPHAMASK)>>24);
 										//	  l->frontsector->ColorMap->Desaturate);
 					}
 					alpha=(alpha*255)/100;
diff --git a/src/p_3dfloors.h b/src/p_3dfloors.h
index d15a1356d..6ae29e3c3 100644
--- a/src/p_3dfloors.h
+++ b/src/p_3dfloors.h
@@ -40,7 +40,11 @@ typedef enum
 } ffloortype_e;
 
 // This is for the purpose of Sector_SetContents:
-enum E3DFloorContents : unsigned int
+#ifdef _MSC_VER
+enum : unsigned int // MSVC is apparently the only compiler that supports this syntax
+#else
+enum
+#endif
 {
 	VC_EMPTY = 0, // Here's the original values of the color shifts in Vavoom, and in ARGB:
 	VC_WATER	 = 0x80825032,	// 130, 80, 50, 128		-> 80.82.50.32 (was 0x101080)
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 06c150f95..670672ec7 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -5416,7 +5416,7 @@ fixed_t AActor::GetGravity() const
 // (left precisely the same as MBF even though it doesn't make much sense.)
 bool AActor::IsSentient() const
 {
-	return health > 0 || SeeState != NULL;
+	return health > 0 && SeeState != NULL;
 }