diff --git a/dyninst-10.0.0-result.patch b/dyninst-10.0.0-result.patch
index c59852c..89d6e70 100644
--- a/dyninst-10.0.0-result.patch
+++ b/dyninst-10.0.0-result.patch
@@ -1,24 +1,28 @@
 --- ./dyninst-10.0.0/instructionAPI/h/Result.h.sv	2018-11-09 11:48:08.000000000 -0500
 +++ ./dyninst-10.0.0/instructionAPI/h/Result.h	2018-12-04 22:12:47.369579566 -0500
-@@ -450,8 +450,8 @@
+@@ -449,10 +449,10 @@
+ 	    snprintf(hex, 20, "%x", val.s32val);
  	    break;
  	  case u64:
 -	    snprintf(hex, 20, "%lx", val.u64val);
-+	    snprintf(hex, 20, "%Lx", val.u64val);
++	    snprintf(hex, 20, "%" PRIx64, val.u64val);
  	    break;
  	  case s64:
 -	    snprintf(hex, 20, "%lx", val.s64val);
-+	    snprintf(hex, 20, "%Lx", val.s64val);
++	    snprintf(hex, 20, "%" PRIx64, val.s64val);
  	    break;
  	  case sp_float:
-@@ -465,8 +465,8 @@
+ 	    snprintf(hex, 20, "%f", val.floatval);
+@@ -464,10 +464,10 @@
+ 	    snprintf(hex, 20, "%x", val.bitval);
  	    break;
  	  case u48:
 -	    snprintf(hex, 20, "%lx", val.s48val);
-+	    snprintf(hex, 20, "%Lx", val.s48val);
++	    snprintf(hex, 20, "%" PRIx64, val.s48val);
  	    break;
  	  case s48:
 -	    snprintf(hex, 20, "%lx", val.s48val);
-+	    snprintf(hex, 20, "%Lx", val.s48val);
++	    snprintf(hex, 20, "%" PRIx64, val.s48val);
  	    break;
       case m512:
+ 	    snprintf(hex, 20, "%p", val.m512val);
diff --git a/dyninst.spec b/dyninst.spec
index 7a51d4a..44e03ae 100644
--- a/dyninst.spec
+++ b/dyninst.spec
@@ -2,7 +2,7 @@ Summary: An API for Run-time Code Generation
 License: LGPLv2+
 Name: dyninst
 Group: Development/Libraries
-Release: 3%{?dist}
+Release: 4%{?dist}
 URL: http://www.dyninst.org
 Version: 10.0.0
 # Dyninst only has full support for a few architectures.
@@ -204,6 +204,9 @@ find %{buildroot}%{_libdir}/dyninst/testsuite/ \
 %attr(644,root,root) %{_libdir}/dyninst/testsuite/*.a
 
 %changelog
+* Wed Dec 05 2018 Stan Cox <scox@redhat.com> - 10.0.0-4
+- Use PRIx64
+
 * Wed Dec 05 2018 Stan Cox <scox@redhat.com> - 10.0.0-3
 - Patch Result.h for i386.