diff --git a/infer/man/man1/infer-full.txt b/infer/man/man1/infer-full.txt
index 20d9351fc..c008d3a13 100644
--- a/infer/man/man1/infer-full.txt
+++ b/infer/man/man1/infer-full.txt
@@ -1311,6 +1311,11 @@ INTERNAL OPTIONS
        --cost-issues-tests-reset
            Cancel the effect of --cost-issues-tests.
 
+       --cost-scuba-logging
+           Activates: Log unknown functions to scuba in cost/inferbo
+           checkers; also sets --scuba-logging. (Conversely:
+           --no-cost-scuba-logging)
+
        --costs-current-reset
            Cancel the effect of --costs-current.
 
diff --git a/infer/src/base/Config.ml b/infer/src/base/Config.ml
index 4a42052b8..e43c0683f 100644
--- a/infer/src/base/Config.ml
+++ b/infer/src/base/Config.ml
@@ -2025,7 +2025,15 @@ and select =
     "Select bug number $(i,N). If omitted, prompt for input."
 
 
-and scuba_logging = CLOpt.mk_bool ~long:"scuba-logging" "(direct) logging to scuba "
+and scuba_logging, cost_scuba_logging =
+  let scuba_logging = CLOpt.mk_bool ~long:"scuba-logging" "(direct) logging to scuba" in
+  let cost_scuba_logging =
+    CLOpt.mk_bool_group ~long:"cost-scuba-logging"
+      "Log unknown functions to scuba in cost/inferbo checkers; also sets $(b,--scuba-logging)."
+      [scuba_logging] []
+  in
+  (scuba_logging, cost_scuba_logging)
+
 
 and scuba_normals =
   CLOpt.mk_string_map ~long:"scuba-normal"
@@ -2683,6 +2691,8 @@ and costs_current = !costs_current
 
 and cost_issues_tests = !cost_issues_tests
 
+and cost_scuba_logging = !cost_scuba_logging
+
 and costs_previous = !costs_previous
 
 and cxx = !cxx
diff --git a/infer/src/base/Config.mli b/infer/src/base/Config.mli
index 6cddfffcb..c64b11c8a 100644
--- a/infer/src/base/Config.mli
+++ b/infer/src/base/Config.mli
@@ -230,6 +230,8 @@ val costs_current : string option
 
 val cost_issues_tests : string option
 
+val cost_scuba_logging : bool
+
 val costs_previous : string option
 
 val cxx : bool
diff --git a/infer/src/base/ScubaLogging.ml b/infer/src/base/ScubaLogging.ml
index db1986d6b..33bbeea6a 100644
--- a/infer/src/base/ScubaLogging.ml
+++ b/infer/src/base/ScubaLogging.ml
@@ -72,6 +72,8 @@ let log_count ~label ~value = log_one (LogEntry.mk_count ~label ~value)
 
 let log_message ~label ~message = log_one (LogEntry.mk_string ~label ~message)
 
+let cost_log_message ~label ~message = if Config.cost_scuba_logging then log_message ~label ~message
+
 let execute_with_time_logging label f =
   let ret_val, duration_ms = Utils.timeit ~f in
   let entry = LogEntry.mk_time ~label ~duration_ms in
diff --git a/infer/src/base/ScubaLogging.mli b/infer/src/base/ScubaLogging.mli
index 47cfdcd49..749601e33 100644
--- a/infer/src/base/ScubaLogging.mli
+++ b/infer/src/base/ScubaLogging.mli
@@ -21,6 +21,9 @@ val log_count : label:string -> value:int -> unit
 val log_message : label:string -> message:string -> unit
 (** Log a [string]. Event is prefixed with ["msg."] *)
 
+val cost_log_message : label:string -> message:string -> unit
+(** Similar to [log_message], but log only when [--cost-scuba-logging] option is given. *)
+
 val execute_with_time_logging : string -> (unit -> 'a) -> 'a
 (** A helper to log execution time of a particular function. Use this to measure a performance of a
     given function. Example:
diff --git a/infer/src/bufferoverrun/bufferOverrunAnalysis.ml b/infer/src/bufferoverrun/bufferOverrunAnalysis.ml
index a1ca26e60..599706b1c 100644
--- a/infer/src/bufferoverrun/bufferOverrunAnalysis.ml
+++ b/infer/src/bufferoverrun/bufferOverrunAnalysis.ml
@@ -414,7 +414,7 @@ module TransferFunctions = struct
             | _, `NotFound ->
                 (* This may happen for procedures with a biabduction model too. *)
                 L.d_printfln_escaped "/!\\ Unknown call to %a" Procname.pp callee_pname ;
-                ScubaLogging.log_message ~label:"unmodeled_function_inferbo"
+                ScubaLogging.cost_log_message ~label:"unmodeled_function_inferbo"
                   ~message:(F.asprintf "Unmodeled Function[Inferbo] : %a" Procname.pp callee_pname) ;
                 Dom.Mem.add_unknown_from ret ~callee_pname ~location mem ) )
     | Call (((id, _) as ret), fun_exp, _, location, _) ->
diff --git a/infer/src/cost/cost.ml b/infer/src/cost/cost.ml
index 517a27a96..10010930c 100644
--- a/infer/src/cost/cost.ml
+++ b/infer/src/cost/cost.ml
@@ -108,7 +108,7 @@ module InstrBasicCostWithReason = struct
                     then CostDomain.unit_cost_atomic_operation
                     else instantiated_cost
                 | `NotFound ->
-                    ScubaLogging.log_message ~label:"unmodeled_function_cost_analysis"
+                    ScubaLogging.cost_log_message ~label:"unmodeled_function_cost_analysis"
                       ~message:
                         (F.asprintf "Unmodeled Function[Cost Analysis] : %a" Procname.pp
                            callee_pname) ;
@@ -191,7 +191,7 @@ module WorstCaseCost = struct
           exec_node tenv extras pair |> CostDomain.plus acc )
     in
     Option.iter (CostDomain.get_operation_cost cost).top_pname_opt ~f:(fun top_pname ->
-        ScubaLogging.log_message ~label:"unmodeled_function_top_cost"
+        ScubaLogging.cost_log_message ~label:"unmodeled_function_top_cost"
           ~message:(F.asprintf "Unmodeled Function[Top Cost] : %a" Procname.pp top_pname) ;
         Logging.(debug Analysis Verbose)
           "@ Unmodeled Function[Top Cost]: %a@\n" Procname.pp top_pname ) ;