diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/StackTrace.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/StackTrace.cs
index d67a6a33b3786f..fb860a338679b9 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/StackTrace.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/StackTrace.cs
@@ -201,8 +201,11 @@ internal string ToString(TraceFormat traceFormat)
 
         internal void ToString(TraceFormat traceFormat, StringBuilder sb)
         {
-            string word_At = SR.Word_At;
-            string inFileLineNum = SR.StackTrace_InFileLineNumber;
+            // Passing a default string for "at" in case SR.UsingResourceKeys() is true
+            // as this is a special case and we don't want to have "Word_At" on stack traces.
+            string word_At = SR.GetResourceString(nameof(SR.Word_At), defaultString: "at");
+            // We also want to pass in a default for inFileLineNumber.
+            string inFileLineNum = SR.GetResourceString(nameof(SR.StackTrace_InFileLineNumber), defaultString: "in {0}:line {1}");
             bool fFirstFrame = true;
             for (int iFrameIndex = 0; iFrameIndex < _numOfFrames; iFrameIndex++)
             {
@@ -326,7 +329,9 @@ internal void ToString(TraceFormat traceFormat, StringBuilder sb)
                     if (sf.IsLastFrameFromForeignExceptionStackTrace && !isAsync)
                     {
                         sb.AppendLine();
-                        sb.Append(SR.Exception_EndStackTraceFromPreviousThrow);
+                        // Passing default for Exception_EndStackTraceFromPreviousThrow in case SR.UsingResourceKeys is set.
+                        sb.Append(SR.GetResourceString(nameof(SR.Exception_EndStackTraceFromPreviousThrow),
+                            defaultString: "--- End of stack trace from previous location ---"));
                     }
                 }
             }