diff --git a/library/md_wrap.c b/library/md_wrap.c
index 6447622..834e241 100644
--- a/library/md_wrap.c
+++ b/library/md_wrap.c
@@ -104,7 +104,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -194,7 +194,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -282,7 +282,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -370,7 +370,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -458,7 +458,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -555,7 +555,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -652,7 +652,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -753,7 +753,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }
 
@@ -850,7 +850,7 @@
 #else
     ((void) path);
     ((void) output);
-    return POLARSSL_ERR_MD_FEATURE_UNAVAILABLE;
+    return( POLARSSL_ERR_MD_FEATURE_UNAVAILABLE );
 #endif
 }