diff --git a/src/dxso/dxso_compiler.cpp b/src/dxso/dxso_compiler.cpp
index c6ca4fcd..d1d7a68b 100644
--- a/src/dxso/dxso_compiler.cpp
+++ b/src/dxso/dxso_compiler.cpp
@@ -41,6 +41,7 @@ namespace dxvk {
 
     m_usedSamplers = 0;
     m_usedRTs      = 0;
+    m_rRegs.reserve(DxsoMaxTempRegs);
 
     for (uint32_t i = 0; i < m_rRegs.size(); i++)
       m_rRegs.at(i)  = DxsoRegisterPointer{ };
@@ -1043,6 +1044,8 @@ namespace dxvk {
       const DxsoBaseRegister* relative) {
     switch (reg.id.type) {
       case DxsoRegisterType::Temp: {
+        if (reg.id.num >= m_rRegs.size())
+          m_rRegs.resize( reg.id.num + 1, DxsoRegisterPointer { } );
         DxsoRegisterPointer& ptr = m_rRegs.at(reg.id.num);
         if (ptr.id == 0) {
           std::string name = str::format("r", reg.id.num);
diff --git a/src/dxso/dxso_compiler.h b/src/dxso/dxso_compiler.h
index b96124f9..05daca70 100644
--- a/src/dxso/dxso_compiler.h
+++ b/src/dxso/dxso_compiler.h
@@ -272,9 +272,7 @@ namespace dxvk {
     ////////////////////////////////////////////////
     // Temporary r# vector registers with immediate
     // indexing, and x# vector array registers.
-    std::array<
-      DxsoRegisterPointer,
-      DxsoMaxTempRegs> m_rRegs;
+    std::vector<DxsoRegisterPointer> m_rRegs;
 
     ////////////////////////////////////////////////
     // Predicate registers