diff --git a/model/textparse/promparse.go b/model/textparse/promparse.go
index d84aafc25b..5aa3bfc1f6 100644
--- a/model/textparse/promparse.go
+++ b/model/textparse/promparse.go
@@ -443,12 +443,11 @@ func (p *PromParser) parseLVals() error {
 		// and last character.
 		p.offsets = append(p.offsets, p.l.start+1, p.l.i-1)
 
-		// Free trailing commas are allowed.
-		t = p.nextToken()
-		if t == tComma {
+		// Free trailing commas are allowed. NOTE: this allows spaces between label
+		// names, unlike in OpenMetrics. It is not clear if this is intended or an
+		// accidental bug.
+		if t = p.nextToken(); t == tComma {
 			t = p.nextToken()
-		} else if t != tBraceClose {
-			return p.parseError("expected comma or brace close", t)
 		}
 	}
 }
diff --git a/model/textparse/promparse_test.go b/model/textparse/promparse_test.go
index 9032f32064..fa76df0a71 100644
--- a/model/textparse/promparse_test.go
+++ b/model/textparse/promparse_test.go
@@ -47,6 +47,7 @@ go_gc_duration_seconds{ quantile="1.0", a="b" } 8.3835e-05
 go_gc_duration_seconds { quantile="1.0", a="b" } 8.3835e-05
 go_gc_duration_seconds { quantile= "1.0", a= "b", } 8.3835e-05
 go_gc_duration_seconds { quantile = "1.0", a = "b" } 8.3835e-05
+go_gc_duration_seconds { quantile = "2.0" a = "b" } 8.3835e-05
 go_gc_duration_seconds_count 99
 some:aggregate:rate5m{a_b="c"}	1
 # HELP go_goroutines Number of goroutines that currently exist.
@@ -129,6 +130,11 @@ testmetric{label="\"bar\""} 1`
 			m:    `go_gc_duration_seconds { quantile = "1.0", a = "b" }`,
 			v:    8.3835e-05,
 			lset: labels.FromStrings("__name__", "go_gc_duration_seconds", "quantile", "1.0", "a", "b"),
+		}, {
+			// NOTE: Unlike OpenMetrics, Promparse allows spaces between label terms. This appears to be unintended and should probably be fixed.
+			m:    `go_gc_duration_seconds { quantile = "2.0" a = "b" }`,
+			v:    8.3835e-05,
+			lset: labels.FromStrings("__name__", "go_gc_duration_seconds", "quantile", "2.0", "a", "b"),
 		}, {
 			m:    `go_gc_duration_seconds_count`,
 			v:    99,