diff --git a/src/compiler/isaspec/decode.py b/src/compiler/isaspec/decode.py
index 6d614806d56..832197c0142 100755
--- a/src/compiler/isaspec/decode.py
+++ b/src/compiler/isaspec/decode.py
@@ -209,7 +209,7 @@ static const struct isa_bitset bitset_${bitset.get_c_name()}_gen_${bitset.gen_mi
 %endfor
 
 %for root_name, root in isa.roots.items():
-const struct isa_bitset *${root.get_c_name()}[];
+static const struct isa_bitset *${root.get_c_name()}[];
 %endfor
 
 /*
@@ -301,7 +301,7 @@ static const struct isa_bitset bitset_${bitset.get_c_name()}_gen_${bitset.gen_mi
  */
 
 %for root_name, root in isa.roots.items():
-const struct isa_bitset *${root.get_c_name()}[] = {
+static const struct isa_bitset *${root.get_c_name()}[] = {
 %   for leaf_name, leafs in isa.leafs.items():
 %      for leaf in leafs:
 %         if leaf.get_root() == root: