diff --git a/compressed_decoder.sv b/compressed_decoder.sv
index 60f2631c..5658fd27 100644
--- a/compressed_decoder.sv
+++ b/compressed_decoder.sv
@@ -82,6 +82,10 @@ module compressed_decoder
               // c.sltr
               // c.srl -> srl rd', rd', rs2'
               5'b00101: instr_o = {7'b0, 2'b01, instr_i[4:2], 2'b01, instr_i[9:7], 3'b101, 2'b01, instr_i[9:7], `OPCODE_OP};
+              // c.sllr -> sll rd', rs1', rd'
+              5'b01100: instr_o = {7'b0, 2'b01, instr_i[4:2], 2'b01, instr_i[4:2], 3'b001, 2'b01, instr_i[4:2], `OPCODE_OP};
+              // c.srlr
+              // c.sltr
               // c.sltur -> sltu rd', rs1', rd'
               5'b01111: instr_o = {7'b0, 2'b01, instr_i[4:2], 2'b01, instr_i[9:7], 3'b011, 2'b01, instr_i[4:2], `OPCODE_OP};
               default:  illegal_instr_o = 1'b1;
diff --git a/include/defines.sv b/include/defines.sv
index 35351582..44ece07d 100644
--- a/include/defines.sv
+++ b/include/defines.sv
@@ -29,6 +29,8 @@
 // http://patorjk.com/software/taag/#p=display&v=0&f=Standard&t=Fancy%20ASCII%20Art
 ////////////////////////////////////////////////////////////////////////////////
 
+`ifndef _CORE_DEFINES
+`define _CORE_DEFINES
 
 
 ////////////////////////////////////////////////
@@ -383,3 +385,5 @@ endfunction // prettyPrintInstruction
 //`define TCDM_ADDR_PRECAL
 
 //`define BRANCH_PREDICTION
+
+`endif