diff --git a/core/corehttp/gateway_handler.go b/core/corehttp/gateway_handler.go
index 2729f04e619..2c3821ea0e1 100644
--- a/core/corehttp/gateway_handler.go
+++ b/core/corehttp/gateway_handler.go
@@ -15,6 +15,7 @@ import (
 	"time"
 
 	humanize "github.com/dustin/go-humanize"
+	"github.com/gabriel-vasile/mimetype"
 	"github.com/ipfs/go-cid"
 	files "github.com/ipfs/go-ipfs-files"
 	dag "github.com/ipfs/go-merkledag"
@@ -376,10 +377,16 @@ func (i *gatewayHandler) serveFile(w http.ResponseWriter, req *http.Request, nam
 	} else {
 		ctype = mime.TypeByExtension(gopath.Ext(name))
 		if ctype == "" {
-			buf := make([]byte, 512)
-			n, _ := io.ReadFull(content, buf[:])
-			ctype = http.DetectContentType(buf[:n])
-			_, err := content.Seek(0, io.SeekStart)
+			// uses https://github.com/gabriel-vasile/mimetype library to determine the content type.
+			// Fixes https://github.com/ipfs/go-ipfs/issues/7252
+			mimeType, err := mimetype.DetectReader(content)
+			if err != nil {
+				http.Error(w, fmt.Sprintf("cannot detect content-type: %s", err.Error()), http.StatusInternalServerError)
+				return
+			}
+
+			ctype = mimeType.String()
+			_, err = content.Seek(0, io.SeekStart)
 			if err != nil {
 				http.Error(w, "seeker can't seek", http.StatusInternalServerError)
 				return
diff --git a/go.mod b/go.mod
index bd0f6909639..16626fdbfed 100644
--- a/go.mod
+++ b/go.mod
@@ -10,6 +10,7 @@ require (
 	github.com/elgris/jsondiff v0.0.0-20160530203242-765b5c24c302
 	github.com/fatih/color v1.9.0 // indirect
 	github.com/fsnotify/fsnotify v1.4.9
+	github.com/gabriel-vasile/mimetype v1.1.0
 	github.com/go-bindata/go-bindata/v3 v3.1.3
 	github.com/gogo/protobuf v1.3.1
 	github.com/hashicorp/go-multierror v1.1.0
diff --git a/go.sum b/go.sum
index 461f6ad69a5..3e6d0c346d4 100644
--- a/go.sum
+++ b/go.sum
@@ -117,6 +117,8 @@ github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/gabriel-vasile/mimetype v1.1.0 h1:+ahX+MvQPFve4kO9Qjjxf3j49i0ACdV236kJlOCRAnU=
+github.com/gabriel-vasile/mimetype v1.1.0/go.mod h1:6CDPel/o/3/s4+bp6kIbsWATq8pmgOisOPG40CJa6To=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
 github.com/go-bindata/go-bindata/v3 v3.1.3 h1:F0nVttLC3ws0ojc7p60veTurcOm//D4QBODNM7EGrCI=
@@ -1196,6 +1198,7 @@ golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200413165638-669c56c373c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200420163511-1957bb5e6d1f h1:gWF768j/LaZugp8dyS4UwsslYCYz9XgFxvlgsn0n9H8=
 golang.org/x/sys v0.0.0-20200420163511-1957bb5e6d1f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=