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-rw-r--r--frontends/ast/simplify.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index 9e797573..969cc230 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -1365,6 +1365,8 @@ skip_dynamic_range_lvalue_expansion:;
log_error("Failed to evaluate system function `%s' with non-constant value at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
RTLIL::Const arg_value = buf->bitsAsConst();
+ if (arg_value.as_bool())
+ arg_value = const_sub(arg_value, 1, false, false, SIZE(arg_value));
delete buf;
uint32_t result = 0;