diff --git a/src/codegen_new/codegen_ir_defs.h b/src/codegen_new/codegen_ir_defs.h
index 86276a053..618bd9b7f 100644
--- a/src/codegen_new/codegen_ir_defs.h
+++ b/src/codegen_new/codegen_ir_defs.h
@@ -9,7 +9,7 @@
   All registers must have been written back or discarded.
   This should be used when calling external functions that may change any emulated
   registers.*/
-#define UOP_TYPE_BARRIER (1 << 31)
+#define UOP_TYPE_BARRIER (1u << 31)
 
 /*uOP is a barrier. All previous uOPs must have completed before this one executes.
   All registers must have been written back, but do not have to be discarded.
diff --git a/src/pic.c b/src/pic.c
index 899029c14..efe81f470 100644
--- a/src/pic.c
+++ b/src/pic.c
@@ -222,7 +222,7 @@ find_best_interrupt(pic_t *dev)
 	if (dev == &pic2)
 		intr += 8;
 
-	if (cpu_fast_off_flags & (1 << intr))
+	if (cpu_fast_off_flags & (1u << intr))
 		cpu_fast_off_count = cpu_fast_off_val + 1;
     }
 
diff --git a/src/video/vid_svga.c b/src/video/vid_svga.c
index c5ff2ed43..b760945a7 100644
--- a/src/video/vid_svga.c
+++ b/src/video/vid_svga.c
@@ -936,11 +936,11 @@ svga_init(const device_t *info, svga_t *svga, void *p, int memsize,
     svga->dispontime = 1000ull << 32;
     svga->dispofftime = 1000ull << 32;
     svga->bpp = 8;
-    svga->vram = malloc(memsize);
+    svga->vram = calloc(memsize, 1);
     svga->vram_max = memsize;
     svga->vram_display_mask = svga->vram_mask = memsize - 1;
     svga->decode_mask = 0x7fffff;
-    svga->changedvram = malloc(memsize >> 12);
+    svga->changedvram = calloc(memsize >> 12, 1);
     svga->recalctimings_ex = recalctimings_ex;
     svga->video_in  = video_in;
     svga->video_out = video_out;