--- src/lcms2_internal.h.orig
+++ src/lcms2_internal.h
@@ -37,6 +37,7 @@
 // assert macro is part of C99 as per 7.2
 #include <assert.h>
 
+#pragma GCC visibility push(hidden)
 // Some needed constants
 #ifndef M_PI
 #       define M_PI        3.14159265358979323846
@@ -625,4 +626,5 @@ cmsBool   _cmsBuildRGB2XYZtransferMatrix
 
 
 #define _lcms_internal_H
+#pragma GCC visibility pop
 #endif