diff --git a/release-notes/CREDITS-2.x b/release-notes/CREDITS-2.x
index 82fd2be1c..0a2d6ef63 100644
--- a/release-notes/CREDITS-2.x
+++ b/release-notes/CREDITS-2.x
@@ -363,6 +363,11 @@ Knut Wannheden (@knutwannheden)
  * Contributed #518: Should not read past end for CBOR string values
   (2.18.1)
 
+Steven Fackler (@sfackler)
+ * Reported #300: (smile) Floats are encoded with sign extension while
+   doubles without
+  (2.19.0)
+
 Idan Sheinberg (@sheinbergon)
  * Reported #308: (avro) Incorrect serialization for `LogicalType.Decimal` (Java
    `BigDecimal`)
diff --git a/release-notes/VERSION-2.x b/release-notes/VERSION-2.x
index 2eb5bee48..59838536d 100644
--- a/release-notes/VERSION-2.x
+++ b/release-notes/VERSION-2.x
@@ -16,6 +16,8 @@ Active maintainers:
 
 2.19.0 (not yet released)
 
+#300: (smile) Floats are encoded with sign extension while doubles without
+ (reported by Steven F)
 #308: (avro) Incorrect serialization for `LogicalType.Decimal` (Java `BigDecimal`)
  (reported by Idan S)
  (fix contributed by Michal F)
diff --git a/smile/src/main/java/com/fasterxml/jackson/dataformat/smile/SmileGenerator.java b/smile/src/main/java/com/fasterxml/jackson/dataformat/smile/SmileGenerator.java
index 771406e93..368775fa6 100644
--- a/smile/src/main/java/com/fasterxml/jackson/dataformat/smile/SmileGenerator.java
+++ b/smile/src/main/java/com/fasterxml/jackson/dataformat/smile/SmileGenerator.java
@@ -1726,13 +1726,13 @@ public void writeNumber(float f) throws IOException
         int i = Float.floatToRawIntBits(f);
         _outputBuffer[_outputTail++] = TOKEN_BYTE_FLOAT_32;
         _outputBuffer[_outputTail+4] = (byte) (i & 0x7F);
-        i >>= 7;
+        i >>>= 7;
         _outputBuffer[_outputTail+3] = (byte) (i & 0x7F);
-        i >>= 7;
+        i >>>= 7;
         _outputBuffer[_outputTail+2] = (byte) (i & 0x7F);
-        i >>= 7;
+        i >>>= 7;
         _outputBuffer[_outputTail+1] = (byte) (i & 0x7F);
-        i >>= 7;
+        i >>>= 7;
         _outputBuffer[_outputTail] = (byte) (i & 0x7F);
         _outputTail += 5;
     }
diff --git a/smile/src/test/java/com/fasterxml/jackson/dataformat/smile/gen/SmileGeneratorNumbersTest.java b/smile/src/test/java/com/fasterxml/jackson/dataformat/smile/gen/SmileGeneratorNumbersTest.java
index 4ed819db4..22b67b9d5 100644
--- a/smile/src/test/java/com/fasterxml/jackson/dataformat/smile/gen/SmileGeneratorNumbersTest.java
+++ b/smile/src/test/java/com/fasterxml/jackson/dataformat/smile/gen/SmileGeneratorNumbersTest.java
@@ -1,11 +1,13 @@
 package com.fasterxml.jackson.dataformat.smile.gen;
 
 import java.io.ByteArrayOutputStream;
+import java.util.Arrays;
 
 import org.junit.jupiter.api.Test;
 
 import com.fasterxml.jackson.dataformat.smile.*;
 
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class SmileGeneratorNumbersTest
@@ -146,7 +148,12 @@ public void testFloatUnusedBits() throws Exception
         byte[] encoded = out.toByteArray();
         assertEquals(6, encoded.length);
         assertEquals(0x28, encoded[0]); // type byte, float
-    }
+
+        // From 0x80 0x00 0x00 0x00 (spread over 5 x 7bits)
+        assertArrayEquals(new byte[] {
+                0x08, 0x00, 0x00, 0x00, 0x00
+        }, Arrays.copyOfRange(encoded, 1, encoded.length));
+}
 
     // [dataformats-binary#300]
     @Test
@@ -159,6 +166,12 @@ public void testDoubleUnusedBits() throws Exception
         byte[] encoded = out.toByteArray();
         assertEquals(11, encoded.length);
         assertEquals(0x29, encoded[0]); // type byte, double
+        // From 0x80 0x00 0x00 0x00 ... 0x00 (spread over 10 x 7 bits)
+
+        assertArrayEquals(new byte[] {
+                0x01, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00
+        }, Arrays.copyOfRange(encoded, 1, encoded.length));
     }
 
     // #16: Problems with 'Stringified' numbers