diff --git a/imgui.cpp b/imgui.cpp
index 5bf2ec239..6aa9e9070 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -16737,7 +16737,7 @@ static const char* FormatTextureRefForDebugDisplay(char* buf, int buf_size, ImTe
     char* buf_end = buf + buf_size;
     if (tex_ref._TexData != NULL)
         buf_p += ImFormatString(buf_p, buf_end - buf_p, "#%03d: ", tex_ref._TexData->UniqueID);
-    ImFormatString(buf_p, buf_end - buf_p, "0x%X", ImGui::DebugTextureIDToU64(tex_ref.GetTexID()));
+    ImFormatString(buf_p, buf_end - buf_p, "0x%llX", (unsigned long long)ImGui::DebugTextureIDToU64(tex_ref.GetTexID()));
     return buf;
 }
 
diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 83ceaddc0..365b29ea9 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -3722,9 +3722,9 @@ void ImTextureData::Create(ImTextureFormat format, int w, int h)
     Height = h;
     BytesPerPixel = ImTextureDataGetFormatBytesPerPixel(format);
     UseColors = false;
-    Pixels = (unsigned char*)IM_ALLOC(Width * Height * BytesPerPixel);
+    Pixels = (unsigned char*)IM_ALLOC((size_t)Width * (size_t)Height * (size_t)BytesPerPixel);
     IM_ASSERT(Pixels != NULL);
-    memset(Pixels, 0, Width * Height * BytesPerPixel);
+    memset(Pixels, 0, (size_t)Width * (size_t)Height * (size_t)BytesPerPixel);
     UsedRect.x = UsedRect.y = UsedRect.w = UsedRect.h = 0;
     UpdateRect.x = UpdateRect.y = (unsigned short)~0;
     UpdateRect.w = UpdateRect.h = 0;
@@ -4215,7 +4215,7 @@ void ImFontAtlasTextureBlockCopy(ImTextureData* src_tex, int src_x, int src_y, I
     IM_ASSERT(dst_x >= 0 && dst_x + w <= dst_tex->Width);
     IM_ASSERT(dst_y >= 0 && dst_y + h <= dst_tex->Height);
     for (int y = 0; y < h; y++)
-        memcpy(dst_tex->GetPixelsAt(dst_x, dst_y + y), src_tex->GetPixelsAt(src_x, src_y + y), w * dst_tex->BytesPerPixel);
+        memcpy(dst_tex->GetPixelsAt(dst_x, dst_y + y), src_tex->GetPixelsAt(src_x, src_y + y), (size_t)w * (size_t)dst_tex->BytesPerPixel);
 }
 
 void ImFontAtlasTextureBlockQueueUpload(ImFontAtlas* atlas, ImTextureData* tex, int x, int y, int w, int h)
@@ -6343,9 +6343,9 @@ static bool ImGui_ImplStbTrueType_FontBakedLoadGlyph(ImFontAtlas* atlas, ImFontC
         // Render
         stbtt_GetGlyphBitmapBox(&bd_font_data->FontInfo, glyph_index, scale_for_raster_x, scale_for_raster_y, &x0, &y0, &x1, &y1);
         ImFontAtlasBuilder* builder = atlas->Builder;
-        builder->TempBuffer.resize(w * h * 1);
+        builder->TempBuffer.resize((size_t)w * (size_t)h);
         unsigned char* bitmap_pixels = builder->TempBuffer.Data;
-        memset(bitmap_pixels, 0, w * h * 1);
+        memset(bitmap_pixels, 0, (size_t)w * (size_t)h);
 
         // Render with oversampling
         // (those functions conveniently assert if pixels are not cleared, which is another safety layer)
diff --git a/imstb_truetype.h b/imstb_truetype.h
index ec4d42c7d..5114a2569 100644
--- a/imstb_truetype.h
+++ b/imstb_truetype.h
@@ -3747,7 +3747,7 @@ STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info
    if (yoff  ) *yoff   = iy0;
 
    if (gbm.w && gbm.h) {
-      gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
+      gbm.pixels = (unsigned char *) STBTT_malloc((size_t)gbm.w * (size_t)gbm.h, info->userdata);
       if (gbm.pixels) {
          gbm.stride = gbm.w;
 
@@ -3830,7 +3830,7 @@ static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset,  // fo
    f.userdata = NULL;
    if (!stbtt_InitFont(&f, data, offset))
       return -1;
-   STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+   STBTT_memset(pixels, 0, (size_t)pw * (size_t)ph); // background of 0 around pixels
    x=y=1;
    bottom_y = 1;
 
@@ -3989,7 +3989,7 @@ STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, in
    stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
 
    if (pixels)
-      STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+      STBTT_memset(pixels, 0, (size_t)pw * (size_t)ph); // background of 0 around pixels
 
    return 1;
 }
@@ -4616,8 +4616,8 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
       float *precompute;
       stbtt_vertex *verts;
       int num_verts = stbtt_GetGlyphShape(info, glyph, &verts);
-      data = (unsigned char *) STBTT_malloc(w * h, info->userdata);
-      precompute = (float *) STBTT_malloc(num_verts * sizeof(float), info->userdata);
+      data = (unsigned char *) STBTT_malloc((size_t)w * (size_t)h, info->userdata);
+      precompute = (float *) STBTT_malloc((size_t)num_verts * sizeof(float), info->userdata);
 
       for (i=0,j=num_verts-1; i < num_verts; j=i++) {
          if (verts[i].type == STBTT_vline) {