diff --git a/src/systemc/ext/dt/int/sc_nbdefs.hh b/src/systemc/ext/dt/int/sc_nbdefs.hh
index 3854a9198c..536a0fc2c7 100644
--- a/src/systemc/ext/dt/int/sc_nbdefs.hh
+++ b/src/systemc/ext/dt/int/sc_nbdefs.hh
@@ -164,7 +164,7 @@ typedef unsigned int sc_digit; // 32-bit unsigned integer
 
 // Support for the long long type. This type is not in the standard
 // but is usually supported by compilers.
-#if defined(__x86_64__) || defined(__aarch64__)
+#if defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__)
 typedef long long int64;
 typedef unsigned long long uint64;
 #else