diff --git a/pkg/api/handlers/compat/images.go b/pkg/api/handlers/compat/images.go
index 3734959cf9..189bcb7989 100644
--- a/pkg/api/handlers/compat/images.go
+++ b/pkg/api/handlers/compat/images.go
@@ -416,9 +416,10 @@ func GetImages(w http.ResponseWriter, r *http.Request) {
 	decoder := utils.GetDecoder(r)
 	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
 	query := struct {
-		All     bool
-		Digests bool
-		Filter  string // Docker 1.24 compatibility
+		All        bool
+		Digests    bool
+		Filter     string // Docker 1.24 compatibility
+		SharedSize bool   `schema:"shared-size"` // Docker 1.42 compatibility
 	}{
 		// This is where you can override the golang default value for one of fields
 	}
@@ -477,6 +478,10 @@ func GetImages(w http.ResponseWriter, r *http.Request) {
 			if s.RepoDigests == nil {
 				s.RepoDigests = []string{}
 			}
+			// Docker 1.42 sets SharedSize to -1 if ont passed explicitly
+			if !query.SharedSize {
+				s.SharedSize = -1
+			}
 		}
 	}
 	utils.WriteResponse(w, http.StatusOK, summaries)
diff --git a/test/apiv2/10-images.at b/test/apiv2/10-images.at
index ff9fee17d2..65648e2dc7 100644
--- a/test/apiv2/10-images.at
+++ b/test/apiv2/10-images.at
@@ -455,4 +455,11 @@ t GET images/json 200 \
 podman rmi -f $(< $IIDFILE)
 rm -f $IIDFILE
 
+# check that SharedSize returns -1 for compat api if not set
+# and 0 (or the correct shared size) if set
+t GET images/json 200 \
+    .[0].SharedSize=-1
+t GET images/json?shared-size=true 200 \
+    .[0].SharedSize=0
+
 # vim: filetype=sh