diff --git a/third_party/lcms/src/cmsopt.c b/third_party/lcms/src/cmsopt.c
index e3212fb4d..a5475709b 100644
--- a/third_party/lcms/src/cmsopt.c
+++ b/third_party/lcms/src/cmsopt.c
@@ -100,6 +100,15 @@ typedef struct {
 
 } Curves16Data;
 
+// A simple adapter to prevent _cmsPipelineEval16Fn vs. _cmsInterpFn16
+// confusion, which trips up UBSAN.
+static
+void Lerp16Adapter(CMSREGISTER const cmsUInt16Number in[],
+                   CMSREGISTER cmsUInt16Number out[],
+                   const void* data) {
+    cmsInterpParams* params = (cmsInterpParams*)data;
+    params->Interpolation.Lerp16(in, out, params);
+}
 
 // Simple optimizations ----------------------------------------------------------------------------------------------------------
 
@@ -805,7 +814,7 @@ Error:
 
     if (DataSetIn == NULL && DataSetOut == NULL) {
 
-        _cmsPipelineSetOptimizationParameters(Dest, (_cmsPipelineEval16Fn) DataCLUT->Params->Interpolation.Lerp16, DataCLUT->Params, NULL, NULL);
+        _cmsPipelineSetOptimizationParameters(Dest, Lerp16Adapter, DataCLUT->Params, NULL, NULL);
     }
     else {