diff --git a/src/coreclr/nativeaot/Runtime/RhConfig.cpp b/src/coreclr/nativeaot/Runtime/RhConfig.cpp
index af6d130bd7dde9..283fe09e3b8fd3 100644
--- a/src/coreclr/nativeaot/Runtime/RhConfig.cpp
+++ b/src/coreclr/nativeaot/Runtime/RhConfig.cpp
@@ -56,7 +56,14 @@ bool RhConfig::Environment::TryGetIntegerValue(const char* name, uint64_t* value
 
     // Environment variable was set. Convert it to an integer.
     uint64_t uiResult = 0;
-    for (uint32_t i = 0; i < cchResult; i++)
+    uint32_t startIndex = 0;
+    if (!decimal && cchResult >= 2 && buffer[0] == '0' && (buffer[1] == 'x' || buffer[1] == 'X'))
+    {
+        startIndex = 2;
+        if (startIndex == cchResult)
+            return false; // parse error - hex prefix without any digits
+    }
+    for (uint32_t i = startIndex; i < cchResult; i++)
     {
         TCHAR ch = buffer[i];