diff --git a/except.cpp b/except.cpp
index 5625e04e..07ed1ff3 100644
--- a/except.cpp
+++ b/except.cpp
@@ -60,7 +60,7 @@ errno_error::try_code (void)
 void
 errno_error::try_code (int code)
 {
-    if (code != 0)
+    if (__builtin_expect (code != 0, false))
         throw errno_error(code);
 }
 
@@ -117,10 +117,8 @@ win32_error::try_code (void)
 void
 win32_error::try_code (DWORD id)
 {
-    if (id == ERROR_SUCCESS)
-        return;
-
-    throw_code (id);
+    if (__builtin_expect (id != ERROR_SUCCESS, false))
+        throw_code (id);
 }
 
 
diff --git a/net/except.cpp b/net/except.cpp
index 0ac211c5..d224c49b 100644
--- a/net/except.cpp
+++ b/net/except.cpp
@@ -89,10 +89,8 @@ net::error::throw_code (void)
 //-----------------------------------------------------------------------------
 void
 net::error::try_code (int err) {
-    if (err == 0)
-        return;
-
-    throw_code (err);
+    if (__builtin_expect (err != 0, false))
+        throw_code (err);
 }