diff --git a/implementation/jwt-auth/src/main/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipal.java b/implementation/jwt-auth/src/main/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipal.java
index c30b2bb5..cef77b40 100644
--- a/implementation/jwt-auth/src/main/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipal.java
+++ b/implementation/jwt-auth/src/main/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipal.java
@@ -107,7 +107,10 @@ protected Object getClaimValue(String claimName) {
             case nbf:
             case updated_at:
                 try {
-                    claim = claimsSet.getClaimValue(claimType.name(), Long.class);
+                    Number numberClaim = claimsSet.getClaimValue(claimType.name(), Number.class);
+                    if (numberClaim != null) {
+                        claim = numberClaim.longValue();
+                    }
                     if (claim == null) {
                         claim = 0L;
                     }
diff --git a/testsuite/basic/src/test/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipalTest.java b/testsuite/basic/src/test/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipalTest.java
index dfd3cb9b..edf8fa93 100644
--- a/testsuite/basic/src/test/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipalTest.java
+++ b/testsuite/basic/src/test/java/io/smallrye/jwt/auth/principal/DefaultJWTCallerPrincipalTest.java
@@ -9,6 +9,7 @@
 
 import org.eclipse.microprofile.jwt.Claims;
 import org.eclipse.microprofile.jwt.tck.util.TokenUtils;
+import org.jose4j.jwt.JwtClaims;
 import org.jose4j.jwt.consumer.JwtContext;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -57,4 +58,24 @@ void getAudienceClaim() {
         assertEquals(1, audience.size());
         assertArrayEquals(new String[] { TCK_TOKEN1_AUD }, audience.toArray(new String[0]));
     }
+
+    @Test
+    void claimsWithDecimalValues() {
+        Double exp = 1311281970.5;
+        Double iat = 1311280970.5;
+
+        final JwtClaims claims = context.getJwtClaims();
+        claims.setClaim(Claims.exp.name(), exp);
+        claims.setClaim(Claims.iat.name(), iat);
+        DefaultJWTCallerPrincipal principal = new DefaultJWTCallerPrincipal(claims);
+
+        Long expClaim = principal.getExpirationTime();
+        Long iatClaim = principal.getIssuedAtTime();
+
+        assertNotNull(expClaim);
+        assertNotNull(iatClaim);
+
+        assertEquals(exp.longValue(), expClaim);
+        assertEquals(iat.longValue(), iatClaim);
+    }
 }