diff --git a/dlls/usp10/opentype.c b/dlls/usp10/opentype.c
index dd9c8c42f8..e7f2dfdd93 100644
--- a/dlls/usp10/opentype.c
+++ b/dlls/usp10/opentype.c
@@ -937,12 +937,16 @@ static INT GSUB_apply_ChainContextSubst(const OT_LookupList* lookup, const OT_Lo
         ccsf1 = (const GSUB_ChainContextSubstFormat1*)((const BYTE*)look+offset);
         if (GET_BE_WORD(ccsf1->SubstFormat) == 1)
         {
-            FIXME("  TODO: subtype 1 (Simple context glyph substitution)\n");
+            static int once;
+            if (!once++)
+                FIXME("  TODO: subtype 1 (Simple context glyph substitution)\n");
             continue;
         }
         else if (GET_BE_WORD(ccsf1->SubstFormat) == 2)
         {
-            FIXME("  TODO: subtype 2 (Class-based Chaining Context Glyph Substitution)\n");
+            static int once;
+            if (!once++)
+                FIXME("  TODO: subtype 2 (Class-based Chaining Context Glyph Substitution)\n");
             continue;
         }
         else if (GET_BE_WORD(ccsf1->SubstFormat) == 3)
@@ -1648,12 +1652,16 @@ static INT GPOS_apply_ChainContextPos(ScriptCache *psc, LPOUTLINETEXTMETRICW lpo
 
         if (GET_BE_WORD(ccpf3->PosFormat) == 1)
         {
-            FIXME("  TODO: subtype 1 (Simple Chaining Context Glyph Positioning)\n");
+            static int once;
+            if (!once++)
+                FIXME("  TODO: subtype 1 (Simple Chaining Context Glyph Positioning)\n");
             continue;
         }
         else if (GET_BE_WORD(ccpf3->PosFormat) == 2)
         {
-            FIXME("  TODO: subtype 2 (Class-based Chaining Context Glyph Positioning)\n");
+            static int once;
+            if (!once++)
+                FIXME("  TODO: subtype 2 (Class-based Chaining Context Glyph Positioning)\n");
             continue;
         }
         else if (GET_BE_WORD(ccpf3->PosFormat) == 3)