diff --git a/src/USER-INTEL/intel_intrinsics_airebo.h b/src/USER-INTEL/intel_intrinsics_airebo.h
index d055ed549a..4a86d8db29 100644
--- a/src/USER-INTEL/intel_intrinsics_airebo.h
+++ b/src/USER-INTEL/intel_intrinsics_airebo.h
@@ -744,7 +744,7 @@ struct intr_types<float,double> {
 
 #include <cassert>
 #include <immintrin.h>
-#include <cstdint>
+#include <stdint.h> // <cstdint> requires C++-11
 
 #define VEC_INLINE __attribute__((always_inline))
 
diff --git a/src/USER-INTEL/pair_airebo_intel.cpp b/src/USER-INTEL/pair_airebo_intel.cpp
index f4071903aa..07f33f7ebe 100644
--- a/src/USER-INTEL/pair_airebo_intel.cpp
+++ b/src/USER-INTEL/pair_airebo_intel.cpp
@@ -23,7 +23,7 @@
 #include <cstring>
 #include <cmath>
 #include <cstdio>
-#include <cstdint>
+#include <stdint.h> // <cstdint> requires C++-11
 #include <cassert>
 #include <cstddef>
 #include "lmptype.h"
diff --git a/src/USER-OMP/pair_agni_omp.cpp b/src/USER-OMP/pair_agni_omp.cpp
index b938511656..e8f003ea88 100644
--- a/src/USER-OMP/pair_agni_omp.cpp
+++ b/src/USER-OMP/pair_agni_omp.cpp
@@ -14,7 +14,7 @@
 
 #include <cmath>
 #include <cstring>
-#include <cstdint>
+#include <stdint.h> // <cstdint> requires C++-11
 #include "pair_agni_omp.h"
 #include "atom.h"
 #include "comm.h"
diff --git a/src/info.cpp b/src/info.cpp
index be832cc6f7..65c0cd9b53 100644
--- a/src/info.cpp
+++ b/src/info.cpp
@@ -51,7 +51,7 @@
 #ifdef _WIN32
 #define PSAPI_VERSION 1
 #include <windows.h>
-#include <cstdint>
+#include <stdint.h> // <cstdint> requires C++-11
 #include <psapi.h>
 #else
 #include <sys/time.h>
diff --git a/src/lmptype.h b/src/lmptype.h
index 76573faa5c..3580df7b52 100644
--- a/src/lmptype.h
+++ b/src/lmptype.h
@@ -37,7 +37,7 @@
 #endif
 
 #include <climits>
-#include <cstdint>
+#include <stdint.h> // <cstdint> requires C++-11
 #include <cinttypes>
 
 // grrr - IBM Power6 does not provide this def in their system header files
diff --git a/src/math_special.cpp b/src/math_special.cpp
index 78b993bb2b..31567bdc77 100644
--- a/src/math_special.cpp
+++ b/src/math_special.cpp
@@ -1,5 +1,5 @@
 #include <cmath>
-#include <cstdint>
+#include <stdint.h> // <cstdint> requires C++-11
 #include "math_special.h"
 
 using namespace LAMMPS_NS;
diff --git a/src/timer.cpp b/src/timer.cpp
index 99468582af..65cb6ab5d8 100644
--- a/src/timer.cpp
+++ b/src/timer.cpp
@@ -22,7 +22,7 @@
 
 #ifdef _WIN32
 #include <windows.h>
-#include <cstdint>
+#include <stdint.h> // <cstdint> requires C++-11
 #else
 #include <sys/time.h>
 #include <sys/resource.h>