diff --git a/base/timing.jl b/base/timing.jl
index f672123b5a21b..3d1a3a02fe10b 100644
--- a/base/timing.jl
+++ b/base/timing.jl
@@ -26,6 +26,7 @@ struct GC_Num
     total_sweep_time  ::Int64
     total_mark_time   ::Int64
     last_full_sweep ::Int64
+    last_incremental_sweep ::Int64
 end
 
 gc_num() = ccall(:jl_gc_num, GC_Num, ())
diff --git a/src/gc.c b/src/gc.c
index 81d062fae3c3a..e9e26bb748994 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -3557,6 +3557,9 @@ static int _jl_gc_collect(jl_ptls_t ptls, jl_gc_collection_t collection)
     if (sweep_full) {
         gc_num.last_full_sweep = gc_end_time;
     }
+    else {
+        gc_num.last_incremental_sweep = gc_end_time;
+    }
 
     // sweeping is over
     // 6. if it is a quick sweep, put back the remembered objects in queued state
diff --git a/src/gc.h b/src/gc.h
index aa2a0f822666c..cf6580bd69df3 100644
--- a/src/gc.h
+++ b/src/gc.h
@@ -83,6 +83,7 @@ typedef struct {
     uint64_t    total_sweep_time;
     uint64_t    total_mark_time;
     uint64_t    last_full_sweep;
+    uint64_t    last_incremental_sweep;
 } jl_gc_num_t;
 
 enum {