diff --git a/.gitattributes b/.gitattributes
index cf49e065cd..583d912e74 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -17347,6 +17347,7 @@ tests/webtbs/tw26749.pp svneol=native#text/pascal
 tests/webtbs/tw2676.pp svneol=native#text/plain
 tests/webtbs/tw26773.pp svneol=native#text/plain
 tests/webtbs/tw2678.pp svneol=native#text/plain
+tests/webtbs/tw26791.pp svneol=native#text/pascal
 tests/webtbs/tw2690.pp svneol=native#text/plain
 tests/webtbs/tw2691.pp svneol=native#text/plain
 tests/webtbs/tw26922.pp svneol=native#text/pascal
diff --git a/tests/webtbs/tw26791.pp b/tests/webtbs/tw26791.pp
new file mode 100644
index 0000000000..9bd10027c4
--- /dev/null
+++ b/tests/webtbs/tw26791.pp
@@ -0,0 +1,12 @@
+{ %opt=-vw -Sew }
+{ %cpu=x86_64,i386 }
+Function Fast_ReciprocalSquareRoot(number: Single): Single;
+    Begin
+        Asm
+            RSQRTSS number, %xmm0
+            MOVLPS %xmm0, __Result
+        End ['xmm0'];
+    End;
+    
+begin
+end.