diff --git a/src/V3ProtectLib.cpp b/src/V3ProtectLib.cpp
index b44edf500..6e64d7563 100644
--- a/src/V3ProtectLib.cpp
+++ b/src/V3ProtectLib.cpp
@@ -353,7 +353,8 @@ class ProtectVisitor : public AstNVisitor {
             nodep->v3error("Unsupported: unpacked arrays with protect-lib on "<<nodep->prettyNameQ());
         }
         if (nodep->direction() == VDirection::INPUT) {
-            if (nodep->isUsedClock()) {
+            if (nodep->isUsedClock()
+                || nodep->attrClocker() == VVarAttrClocker::CLOCKER_YES) {
                 handleClock(nodep);
             } else {
                 handleDataInput(nodep);
diff --git a/test_regress/t/t_prot_lib_secret.v b/test_regress/t/t_prot_lib_secret.v
index 534aca6a1..05ca43e1b 100644
--- a/test_regress/t/t_prot_lib_secret.v
+++ b/test_regress/t/t_prot_lib_secret.v
@@ -25,7 +25,7 @@ module secret #(parameter GATED_CLK = 0)
                input [3:0] [31:0] 	 s4x32_in,
                output logic [3:0] [31:0] s4x32_out,
                input                     clk_en,
-               input 			 clk);
+               input 			 clk /*verilator clocker*/);
 
    logic [31:0] 			 secret_accum_q = 0;
    logic [31:0] 			 secret_value = 7;