diff --git a/skcms.h b/skcms.h
index 808ee29..b4c0f4c 100644
--- a/skcms.h
+++ b/skcms.h
@@ -43,6 +43,9 @@
     float g, a,b,c,d,e,f;
 } skcms_TransferFunction;
 
+SKCMS_API bool skcms_TransferFunction_invert(const skcms_TransferFunction*,
+                                             skcms_TransferFunction*);
+
 // Unified representation of 'curv' or 'para' tag data, or a 1D table from 'mft1' or 'mft2'
 typedef union skcms_Curve {
     struct {
@@ -136,9 +139,6 @@
 // will be used.
 SKCMS_API bool skcms_Parse(const void*, size_t, skcms_ICCProfile*);
 
-// No-op, to be removed.
-static inline void skcms_OptimizeForSpeed(skcms_ICCProfile* p) { (void)p; }
-
 SKCMS_API bool skcms_ApproximateCurve(const skcms_Curve* curve,
                                       skcms_TransferFunction* approx,
                                       float* max_error);
diff --git a/skcms_internal.h b/skcms_internal.h
index 3e2fc2b..384cad0 100644
--- a/skcms_internal.h
+++ b/skcms_internal.h
@@ -23,7 +23,6 @@
 
 // ~~~~ skcms_TransferFunction ~~~~
     float skcms_TransferFunction_eval  (const skcms_TransferFunction*, float);
-    bool  skcms_TransferFunction_invert(const skcms_TransferFunction*, skcms_TransferFunction*);
 
 // ~~~~ skcms_ICCProfile ~~~~
     bool skcms_GetCHAD(const skcms_ICCProfile* profile, skcms_Matrix3x3* m);