diff --git a/src/script_opt/FuncInfo.cc b/src/script_opt/FuncInfo.cc
index 2a962e7dc7..a1499e7eae 100644
--- a/src/script_opt/FuncInfo.cc
+++ b/src/script_opt/FuncInfo.cc
@@ -471,7 +471,7 @@ static std::unordered_map<std::string, unsigned int> func_attrs = {
     {"to_addr", ATTR_IDEMPOTENT},   // can error
     {"to_count", ATTR_IDEMPOTENT},  // can error
     {"to_double", ATTR_IDEMPOTENT}, // can error
-    {"to_int", ATTR_FOLDABLE},
+    {"to_int", ATTR_IDEMPOTENT},    // can error
     {"to_json", ATTR_FOLDABLE},
     {"to_lower", ATTR_FOLDABLE},
     {"to_port", ATTR_IDEMPOTENT}, // can error
diff --git a/testing/btest/Baseline.zam/bifs.to_count/err b/testing/btest/Baseline.zam/bifs.to_count/err
new file mode 100644
index 0000000000..c35b90b21b
--- /dev/null
+++ b/testing/btest/Baseline.zam/bifs.to_count/err
@@ -0,0 +1,4 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+error in <...>/to_count.zeek, line 8: bad conversion to count (int_to_count(-2) and -2)
+error in <...>/to_count.zeek, line 20: bad conversion to count (to_count() and )
+error in <...>/to_count.zeek, line 25: bad conversion to count (to_count(not a count) and not a count)
diff --git a/testing/btest/Baseline.zam/bifs.to_count/out b/testing/btest/Baseline.zam/bifs.to_count/out
new file mode 100644
index 0000000000..d727a32bbe
--- /dev/null
+++ b/testing/btest/Baseline.zam/bifs.to_count/out
@@ -0,0 +1,13 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+0
+2
+3
+4
+7
+0
+18446744073709551611
+205
+206
+0
+123
+9223372036854775808 and 9223372036854775808 are the same