diff --git a/posix.mak b/posix.mak
index 383218221..e8541196e 100644
--- a/posix.mak
+++ b/posix.mak
@@ -252,9 +252,6 @@ libphobos2.a : generated/osx/release/32/libphobos2.a generated/osx/release/64/li
 endif
 
 ifeq ($(MODEL),64)
-DISABLED_TESTS += std/format
-# Still not passing, time to pull out the next issue.
-
 DISABLED_TESTS += std/math
 # seems to infinite loop, need to reduce
 
diff --git a/std/format.d b/std/format.d
index 153a0fca2..9f36f6333 100644
--- a/std/format.d
+++ b/std/format.d
@@ -4367,11 +4367,19 @@ unittest
     s = std.string.format("%d %s", 0x1234AF, 0xAFAFAFAF);
     assert(s == "1193135 2947526575");
 
-    s = std.string.format("%s", 1.2 + 3.4i);
-    assert(s == "1.2+3.4i");
+    version(X86_64)
+    {
+        pragma(msg, "several format tests disabled on x86_64 due to bug 5625");
+    }
+    else
+    {
+        s = std.string.format("%s", 1.2 + 3.4i);
+        assert(s == "1.2+3.4i");
 
-    s = std.string.format("%x %X", 1.32, 6.78f);
-    assert(s == "3ff51eb851eb851f 40D8F5C3");
+        s = std.string.format("%x %X", 1.32, 6.78f);
+        assert(s == "3ff51eb851eb851f 40D8F5C3");
+
+    }
 
     s = std.string.format("%#06.*f",2,12.345);
     assert(s == "012.35");