diff --git a/Core/MIPS/JitCommon/JitBlockCache.cpp b/Core/MIPS/JitCommon/JitBlockCache.cpp
index a08f430ed4..1f0e2e0e29 100644
--- a/Core/MIPS/JitCommon/JitBlockCache.cpp
+++ b/Core/MIPS/JitCommon/JitBlockCache.cpp
@@ -76,7 +76,7 @@ static uint64_t HashJitBlock(const JitBlock &b) {
 }
 
 JitBlockCache::JitBlockCache(MIPSState *mipsState, CodeBlockCommon *codeBlock) :
-	codeBlock_(codeBlock), blocks_(nullptr), num_blocks_(0) {
+	codeBlock_(codeBlock) {
 }
 
 JitBlockCache::~JitBlockCache() {
@@ -90,7 +90,8 @@ bool JitBlock::ContainsAddress(u32 em_address) {
 }
 
 bool JitBlockCache::IsFull() const {
-	return num_blocks_ >= MAX_NUM_BLOCKS - 1;
+	// -10 to safely leave space for some proxy blocks, which we don't check before we allocate (not ideal, but should work).
+	return num_blocks_ >= MAX_NUM_BLOCKS - 10;
 }
 
 void JitBlockCache::Init() {
diff --git a/Core/MIPS/JitCommon/JitBlockCache.h b/Core/MIPS/JitCommon/JitBlockCache.h
index 6fde09d915..71b7df9660 100644
--- a/Core/MIPS/JitCommon/JitBlockCache.h
+++ b/Core/MIPS/JitCommon/JitBlockCache.h
@@ -184,10 +184,10 @@ private:
 	MIPSOpcode GetEmuHackOpForBlock(int block_num) const;
 
 	CodeBlockCommon *codeBlock_;
-	JitBlock *blocks_;
+	JitBlock *blocks_ = nullptr;
 	std::unordered_multimap<u32, int> proxyBlockMap_;
 
-	int num_blocks_;
+	int num_blocks_ = 0;
 	std::unordered_multimap<u32, int> links_to_;
 	std::map<std::pair<u32,u32>, u32> block_map_; // (end_addr, start_addr) -> number