diff --git a/mlir/lib/Dialect/Quant/IR/TypeParser.cpp b/mlir/lib/Dialect/Quant/IR/TypeParser.cpp
--- a/mlir/lib/Dialect/Quant/IR/TypeParser.cpp
+++ b/mlir/lib/Dialect/Quant/IR/TypeParser.cpp
@@ -416,7 +416,7 @@
 static void printCalibratedQuantizedType(CalibratedQuantizedType type,
                                          DialectAsmPrinter &out) {
   out << "calibrated<" << type.getExpressedType();
-  out << "<" << type.getMin() << ", " << type.getMax() << ">";
+  out << "<" << type.getMin() << ":" << type.getMax() << ">";
   out << ">";
 }
 
diff --git a/mlir/test/Dialect/Quant/parse-calibrated.mlir b/mlir/test/Dialect/Quant/parse-calibrated.mlir
--- a/mlir/test/Dialect/Quant/parse-calibrated.mlir
+++ b/mlir/test/Dialect/Quant/parse-calibrated.mlir
@@ -2,7 +2,7 @@
 
 // -----
 // CHECK-LABEL: parseCalibrated
-// CHECK: !quant.calibrated<f32<-0.998, 1.232100e+00>
+// CHECK: !quant.calibrated<f32<-0.998:1.232100e+00>
 !qalias = type !quant.calibrated<f32<-0.998:1.2321>>
 func @parseCalibrated() -> !qalias {
   %0 = "foo"() : () -> !qalias