diff --git a/flink-core/src/main/java/org/apache/flink/types/variant/BinaryVariantInternalBuilder.java b/flink-core/src/main/java/org/apache/flink/types/variant/BinaryVariantInternalBuilder.java
index 3a1ce3c969f67..928c267f3658c 100644
--- a/flink-core/src/main/java/org/apache/flink/types/variant/BinaryVariantInternalBuilder.java
+++ b/flink-core/src/main/java/org/apache/flink/types/variant/BinaryVariantInternalBuilder.java
@@ -290,7 +290,7 @@ public void appendTimestamp(long microsSinceEpoch) {
     public void appendFloat(float f) {
         checkCapacity(1 + 4);
         writeBuffer[writePos++] = primitiveHeader(FLOAT);
-        writeLong(writeBuffer, writePos, Float.floatToIntBits(f), 8);
+        writeLong(writeBuffer, writePos, Float.floatToIntBits(f), 4);
         writePos += 4;
     }
 
diff --git a/flink-core/src/test/java/org/apache/flink/types/variant/BinaryVariantInternalBuilderTest.java b/flink-core/src/test/java/org/apache/flink/types/variant/BinaryVariantInternalBuilderTest.java
index 4e97c6401528c..924e538f40ad6 100644
--- a/flink-core/src/test/java/org/apache/flink/types/variant/BinaryVariantInternalBuilderTest.java
+++ b/flink-core/src/test/java/org/apache/flink/types/variant/BinaryVariantInternalBuilderTest.java
@@ -22,8 +22,11 @@
 
 import java.io.IOException;
 import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.Collections;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 class BinaryVariantInternalBuilderTest {
@@ -116,4 +119,12 @@ void testParseJsonObject() throws IOException {
         assertThat(variant.getField("k1").getByte()).isEqualTo((byte) 2);
         assertThat(variant.getField("k2").getDecimal()).isEqualTo(BigDecimal.valueOf(1.5));
     }
+
+    @Test
+    void testAppendFloat() {
+        BinaryVariantInternalBuilder builder = new BinaryVariantInternalBuilder(false);
+        ArrayList<Float> floatList = new ArrayList<>(Collections.nCopies(25, 4.2f));
+
+        assertThatCode(() -> floatList.forEach(builder::appendFloat)).doesNotThrowAnyException();
+    }
 }