diff --git a/src/hb-ot-cff1-table.hh b/src/hb-ot-cff1-table.hh
index 0d96f0557..6fb59315c 100644
--- a/src/hb-ot-cff1-table.hh
+++ b/src/hb-ot-cff1-table.hh
@@ -1245,27 +1245,27 @@ struct cff1
     }
 
     protected:
-    hb_blob_t	           *blob;
+    hb_blob_t	           *blob = nullptr;
     hb_sanitize_context_t   sc;
 
     public:
-    const Encoding	    *encoding;
-    const Charset	    *charset;
-    const CFF1NameIndex     *nameIndex;
-    const CFF1TopDictIndex  *topDictIndex;
-    const CFF1StringIndex   *stringIndex;
-    const CFF1Subrs	    *globalSubrs;
-    const CFF1CharStrings   *charStrings;
-    const CFF1FDArray       *fdArray;
-    const CFF1FDSelect      *fdSelect;
-    unsigned int	     fdCount;
+    const Encoding	    *encoding = nullptr;
+    const Charset	    *charset = nullptr;
+    const CFF1NameIndex     *nameIndex = nullptr;
+    const CFF1TopDictIndex  *topDictIndex = nullptr;
+    const CFF1StringIndex   *stringIndex = nullptr;
+    const CFF1Subrs	    *globalSubrs = nullptr;
+    const CFF1CharStrings   *charStrings = nullptr;
+    const CFF1FDArray       *fdArray = nullptr;
+    const CFF1FDSelect      *fdSelect = nullptr;
+    unsigned int	     fdCount = 0;
 
     cff1_top_dict_values_t   topDict;
     hb_vector_t<cff1_font_dict_values_t>
 			     fontDicts;
     hb_vector_t<PRIVDICTVAL> privateDicts;
 
-    unsigned int	     num_glyphs;
+    unsigned int	     num_glyphs = 0;
   };
 
   struct accelerator_t : accelerator_templ_t<cff1_private_dict_opset_t, cff1_private_dict_values_t>
diff --git a/src/hb-ot-cff2-table.hh b/src/hb-ot-cff2-table.hh
index f6d1c1c02..6e1b01c8f 100644
--- a/src/hb-ot-cff2-table.hh
+++ b/src/hb-ot-cff2-table.hh
@@ -490,22 +490,22 @@ struct cff2
     bool is_valid () const { return blob; }
 
     protected:
-    hb_blob_t			*blob;
+    hb_blob_t			*blob = nullptr;
     hb_sanitize_context_t	sc;
 
     public:
     cff2_top_dict_values_t	topDict;
-    const CFF2Subrs		*globalSubrs;
-    const CFF2VariationStore	*varStore;
-    const CFF2CharStrings	*charStrings;
-    const CFF2FDArray		*fdArray;
-    const CFF2FDSelect		*fdSelect;
-    unsigned int		fdCount;
+    const CFF2Subrs		*globalSubrs = nullptr;
+    const CFF2VariationStore	*varStore = nullptr;
+    const CFF2CharStrings	*charStrings = nullptr;
+    const CFF2FDArray		*fdArray = nullptr;
+    const CFF2FDSelect		*fdSelect = nullptr;
+    unsigned int		fdCount = 0;
 
     hb_vector_t<cff2_font_dict_values_t>     fontDicts;
     hb_vector_t<PRIVDICTVAL>  privateDicts;
 
-    unsigned int	      num_glyphs;
+    unsigned int	      num_glyphs = 0;
   };
 
   struct accelerator_t : accelerator_templ_t<cff2_private_dict_opset_t, cff2_private_dict_values_t>