diff --git a/src/emucore/elf/ElfParser.cxx b/src/emucore/elf/ElfParser.cxx
index 109ed3291..c471d4789 100644
--- a/src/emucore/elf/ElfParser.cxx
+++ b/src/emucore/elf/ElfParser.cxx
@@ -17,6 +17,9 @@ void ElfParser::parse(const uInt8 *elfData, size_t size)
   this->size = size;
 
   sections.resize(0);
+  symbols.resize(0);
+  relocations.clear();
+  bigEndian = true;
 
   try {
     if (read32(0x00) != ELF_MAGIC) EInvalidElf::raise("bad magic");
@@ -68,9 +71,10 @@ void ElfParser::parse(const uInt8 *elfData, size_t size)
       if (section.info >= sections.size()) EInvalidElf::raise("relocation table for invalid section");
 
       vector<Relocation> rels;
-      rels.reserve(section.size / (section.type == SHT_REL ? REL_ENTRY_SIZE : RELA_ENTRY_SIZE));
+      const size_t relocationCount = section.size / (section.type == SHT_REL ? REL_ENTRY_SIZE : RELA_ENTRY_SIZE);
+      rels.reserve(section.size / relocationCount);
 
-      for (size_t i = 0; i < rels.capacity(); i++) {
+      for (size_t i = 0; i < relocationCount; i++) {
         Relocation rel = readRelocation(i, section);
 
         if (rel.symbol >= symbols.size()) EInvalidElf::raise("invalid relocation symbol");
diff --git a/src/emucore/elf/ElfParser.hxx b/src/emucore/elf/ElfParser.hxx
index ca243b100..f757ac77b 100644
--- a/src/emucore/elf/ElfParser.hxx
+++ b/src/emucore/elf/ElfParser.hxx
@@ -150,6 +150,12 @@ class ElfParser {
     vector<Section> sections;
     vector<Symbol> symbols;
     std::unordered_map<size_t, vector<Relocation>> relocations;
+
+  private:
+    ElfParser(const ElfParser&) = delete;
+    ElfParser(ElfParser&&) = delete;
+    ElfParser& operator=(const ElfParser&) = delete;
+    ElfParser& operator=(ElfParser&&) = delete;
 };
 
 ostream& operator<<(ostream& os, const ElfParser::Section& section);