diff --git a/src/gfx_layout.h b/src/gfx_layout.h
--- a/src/gfx_layout.h
+++ b/src/gfx_layout.h
@@ -96,10 +96,10 @@ public:
 		virtual ~VisualRun() = default;
 		virtual const Font *GetFont() const = 0;
 		virtual int GetGlyphCount() const = 0;
-		virtual const GlyphID *GetGlyphs() const = 0;
-		virtual const float *GetPositions() const = 0;
+		virtual const std::vector<GlyphID> &GetGlyphs() const = 0;
+		virtual const std::vector<float> &GetPositions() const = 0;
 		virtual int GetLeading() const = 0;
-		virtual const int *GetGlyphToCharMap() const = 0;
+		virtual const std::vector<int> &GetGlyphToCharMap() const = 0;
 	};
 
 	/** A single line worth of VisualRuns. */
diff --git a/src/gfx_layout_fallback.cpp b/src/gfx_layout_fallback.cpp
--- a/src/gfx_layout_fallback.cpp
+++ b/src/gfx_layout_fallback.cpp
@@ -49,10 +49,10 @@ public:
 		FallbackVisualRun(Font *font, const char32_t *chars, int glyph_count, int char_offset, int x);
 		const Font *GetFont() const override { return this->font; }
 		int GetGlyphCount() const override { return static_cast<int>(this->glyphs.size()); }
-		const GlyphID *GetGlyphs() const override { return this->glyphs.data(); }
-		const float *GetPositions() const override { return this->positions.data(); }
+		const std::vector<GlyphID> &GetGlyphs() const override { return this->glyphs; }
+		const std::vector<float> &GetPositions() const override { return this->positions; }
 		int GetLeading() const override { return this->GetFont()->fc->GetHeight(); }
-		const int *GetGlyphToCharMap() const override { return this->glyph_to_char.data(); }
+		const std::vector<int> &GetGlyphToCharMap() const override { return this->glyph_to_char; }
 	};
 
 	/** A single line worth of VisualRuns. */
diff --git a/src/gfx_layout_icu.cpp b/src/gfx_layout_icu.cpp
--- a/src/gfx_layout_icu.cpp
+++ b/src/gfx_layout_icu.cpp
@@ -71,9 +71,9 @@ public:
 	public:
 		ICUVisualRun(const ICURun &run, int x);
 
-		const GlyphID *GetGlyphs() const override { return this->glyphs.data(); }
-		const float *GetPositions() const override { return this->positions.data(); }
-		const int *GetGlyphToCharMap() const override { return this->glyph_to_char.data(); }
+		const std::vector<GlyphID> &GetGlyphs() const override { return this->glyphs; }
+		const std::vector<float> &GetPositions() const override { return this->positions; }
+		const std::vector<int> &GetGlyphToCharMap() const override { return this->glyph_to_char; }
 
 		const Font *GetFont() const override { return this->font; }
 		int GetLeading() const override { return this->font->fc->GetHeight(); }
diff --git a/src/os/macosx/string_osx.cpp b/src/os/macosx/string_osx.cpp
--- a/src/os/macosx/string_osx.cpp
+++ b/src/os/macosx/string_osx.cpp
@@ -81,9 +81,9 @@ public:
 		CoreTextVisualRun(CTRunRef run, Font *font, const CoreTextParagraphLayoutFactory::CharType *buff);
 		CoreTextVisualRun(CoreTextVisualRun &&other) = default;
 
-		const GlyphID *GetGlyphs() const override { return &this->glyphs[0]; }
-		const float *GetPositions() const override { return &this->positions[0]; }
-		const int *GetGlyphToCharMap() const override { return &this->glyph_to_char[0]; }
+		const std::vector<GlyphID> &GetGlyphs() const override { return this->glyphs; }
+		const std::vector<float> &GetPositions() const override { return this->positions; }
+		const std::vector<int> &GetGlyphToCharMap() const override { return this->glyph_to_char; }
 
 		const Font *GetFont() const override { return this->font;  }
 		int GetLeading() const override { return this->font->fc->GetHeight(); }
diff --git a/src/os/windows/string_uniscribe.cpp b/src/os/windows/string_uniscribe.cpp
--- a/src/os/windows/string_uniscribe.cpp
+++ b/src/os/windows/string_uniscribe.cpp
@@ -82,19 +82,15 @@ public:
 		int num_glyphs;
 		Font *font;
 
-		mutable int *glyph_to_char = nullptr;
+		mutable std::vector<int> glyph_to_char;
 
 	public:
 		UniscribeVisualRun(const UniscribeRun &range, int x);
 		UniscribeVisualRun(UniscribeVisualRun &&other) noexcept;
-		~UniscribeVisualRun() override
-		{
-			free(this->glyph_to_char);
-		}
 
-		const GlyphID *GetGlyphs() const override { return &this->glyphs[0]; }
-		const float *GetPositions() const override { return &this->positions[0]; }
-		const int *GetGlyphToCharMap() const override;
+		const std::vector<GlyphID> &GetGlyphs() const override { return this->glyphs; }
+		const std::vector<float> &GetPositions() const override { return this->positions; }
+		const std::vector<int> &GetGlyphToCharMap() const override;
 
 		const Font *GetFont() const override { return this->font;  }
 		int GetLeading() const override { return this->font->fc->GetHeight(); }
@@ -492,16 +488,15 @@ UniscribeParagraphLayout::UniscribeVisua
 
 UniscribeParagraphLayout::UniscribeVisualRun::UniscribeVisualRun(UniscribeVisualRun&& other) noexcept
 								: glyphs(std::move(other.glyphs)), positions(std::move(other.positions)), char_to_glyph(std::move(other.char_to_glyph)),
-								  start_pos(other.start_pos), total_advance(other.total_advance), num_glyphs(other.num_glyphs), font(other.font)
+								  start_pos(other.start_pos), total_advance(other.total_advance), num_glyphs(other.num_glyphs), font(other.font),
+								  glyph_to_char(std::move(other.glyph_to_char))
 {
-	this->glyph_to_char = other.glyph_to_char;
-	other.glyph_to_char = nullptr;
 }
 
-const int *UniscribeParagraphLayout::UniscribeVisualRun::GetGlyphToCharMap() const
+const std::vector<int> &UniscribeParagraphLayout::UniscribeVisualRun::GetGlyphToCharMap() const
 {
-	if (this->glyph_to_char == nullptr) {
-		this->glyph_to_char = CallocT<int>(this->GetGlyphCount());
+	if (this->glyph_to_char.empty()) {
+		this->glyph_to_char.resize(this->GetGlyphCount());
 
 		/* The char to glyph array contains the first glyph index of the cluster that is associated
 		 * with each character. It is possible for a cluster to be formed of several chars. */