diff --git a/pkg/logql/syntax/parser.go b/pkg/logql/syntax/parser.go
index ab1ca06faca7e..4415f65e0596f 100644
--- a/pkg/logql/syntax/parser.go
+++ b/pkg/logql/syntax/parser.go
@@ -31,7 +31,13 @@ var parserPool = sync.Pool{
 	},
 }
 
-const maxInputSize = 5120
+// (E.Welch) We originally added this limit from fuzz testing and realizing there should be some maximum limit to an allowed query size.
+// The original limit was 5120 based on some internet searching and a best estimate of what a reasonable limit would be.
+// We have seen use cases with queries containing a lot of filter expressions or long expanded variable names where this limit was too small.
+// Apparently the spec does not specify a limit, and more internet searching suggests almost all browsers will handle 100k+ length urls without issue
+// Some limit here still seems prudent however, so the new limit is now 128k.
+// Also note this is used to allocate the buffer for reading the query string, so there is some memory cost to making this larger.
+const maxInputSize = 131072
 
 func init() {
 	// Improve the error messages coming out of yacc.