diff --git a/avro/src/main/java/tools/jackson/dataformat/avro/deser/AvroParserImpl.java b/avro/src/main/java/tools/jackson/dataformat/avro/deser/AvroParserImpl.java
index 9e19b0fb8..b1bdb04ec 100644
--- a/avro/src/main/java/tools/jackson/dataformat/avro/deser/AvroParserImpl.java
+++ b/avro/src/main/java/tools/jackson/dataformat/avro/deser/AvroParserImpl.java
@@ -205,13 +205,10 @@ public final void _initSchema(AvroSchema schema) throws JacksonException {
     public final boolean isNaN() {
         if (_currToken == JsonToken.VALUE_NUMBER_FLOAT) {
             if ((_numTypesValid & NR_DOUBLE) != 0) {
-                // 10-Mar-2017, tatu: Alas, `Double.isFinite(d)` only added in JDK 8
-                double d = _numberDouble;
-                return Double.isNaN(d) || Double.isInfinite(d);
+                return !Double.isFinite(_numberDouble);
             }
             if ((_numTypesValid & NR_FLOAT) != 0) {
-                float f = _numberFloat;
-                return Float.isNaN(f) || Float.isInfinite(f);
+                return !Float.isFinite(_numberFloat);
             }
         }
         return false;
diff --git a/cbor/src/main/java/tools/jackson/dataformat/cbor/CBORParser.java b/cbor/src/main/java/tools/jackson/dataformat/cbor/CBORParser.java
index c2a046594..6792f96bb 100644
--- a/cbor/src/main/java/tools/jackson/dataformat/cbor/CBORParser.java
+++ b/cbor/src/main/java/tools/jackson/dataformat/cbor/CBORParser.java
@@ -1988,13 +1988,10 @@ private final byte[] _getBinaryFromString(Base64Variant variant) throws JacksonE
     public boolean isNaN() {
         if (_currToken == JsonToken.VALUE_NUMBER_FLOAT) {
             if ((_numTypesValid & NR_DOUBLE) != 0) {
-                // 10-Mar-2017, tatu: Alas, `Double.isFinite(d)` only added in JDK 8
-                double d = _numberDouble;
-                return Double.isNaN(d) || Double.isInfinite(d);
+                return !Double.isFinite(_numberDouble);
             }
             if ((_numTypesValid & NR_FLOAT) != 0) {
-                float f = _numberFloat;
-                return Float.isNaN(f) || Float.isInfinite(f);
+                return !Float.isFinite(_numberFloat);
             }
         }
         return false;
diff --git a/protobuf/src/main/java/tools/jackson/dataformat/protobuf/ProtobufParser.java b/protobuf/src/main/java/tools/jackson/dataformat/protobuf/ProtobufParser.java
index 8fda4e7d0..d2c536864 100644
--- a/protobuf/src/main/java/tools/jackson/dataformat/protobuf/ProtobufParser.java
+++ b/protobuf/src/main/java/tools/jackson/dataformat/protobuf/ProtobufParser.java
@@ -1577,13 +1577,10 @@ public int readBinaryValue(Base64Variant b64variant, OutputStream out) throws Ja
     public boolean isNaN() {
         if (_currToken == JsonToken.VALUE_NUMBER_FLOAT) {
             if ((_numTypesValid & NR_DOUBLE) != 0) {
-                // 10-Mar-2017, tatu: Alas, `Double.isFinite(d)` only added in JDK 8
-                double d = _numberDouble;
-                return Double.isNaN(d) || Double.isInfinite(d);
+                return !Double.isFinite(_numberDouble);
             }
             if ((_numTypesValid & NR_FLOAT) != 0) {
-                float f = _numberFloat;
-                return Float.isNaN(f) || Float.isInfinite(f);
+                return !Float.isFinite(_numberFloat);
             }
         }
         return false;
diff --git a/smile/src/main/java/tools/jackson/dataformat/smile/SmileParserBase.java b/smile/src/main/java/tools/jackson/dataformat/smile/SmileParserBase.java
index 119329dc7..c7e8287f1 100644
--- a/smile/src/main/java/tools/jackson/dataformat/smile/SmileParserBase.java
+++ b/smile/src/main/java/tools/jackson/dataformat/smile/SmileParserBase.java
@@ -350,14 +350,11 @@ public final boolean isNaN() throws JacksonException {
             if (_numTypesValid == NR_UNKNOWN) {
                 _parseNumericValue(); // will also check event type
             }
-            if (_numberType == NumberType.DOUBLE) {
-                // 10-Mar-2017, tatu: Alas, `Double.isFinite(d)` only added in JDK 8
-                double d = _numberDouble;
-                return Double.isNaN(d) || Double.isInfinite(d);
+            if ((_numTypesValid & NR_DOUBLE) != 0) {
+                return !Double.isFinite(_numberDouble);
             }
-            if (_numberType == NumberType.FLOAT) {
-                float f = _numberFloat;
-                return Float.isNaN(f) || Float.isInfinite(f);
+            if ((_numTypesValid & NR_FLOAT) != 0) {
+                return !Float.isFinite(_numberFloat);
             }
         }
         return false;