diff --git a/intern/cycles/kernel/kernel_compat_cuda.h b/intern/cycles/kernel/kernel_compat_cuda.h
index 4094e173da9..ea3b78b7cef 100644
--- a/intern/cycles/kernel/kernel_compat_cuda.h
+++ b/intern/cycles/kernel/kernel_compat_cuda.h
@@ -32,8 +32,12 @@
 
 /* Manual definitions so we can compile without CUDA toolkit. */
 
+#ifdef __CUDACC_RTC__
 typedef unsigned int uint32_t;
 typedef unsigned long long uint64_t;
+#else
+#  include <stdint.h>
+#endif
 typedef unsigned short half;
 typedef unsigned long long CUtexObject;
 
diff --git a/intern/cycles/kernel/kernel_compat_optix.h b/intern/cycles/kernel/kernel_compat_optix.h
index e58d8b2aa63..064c99ca100 100644
--- a/intern/cycles/kernel/kernel_compat_optix.h
+++ b/intern/cycles/kernel/kernel_compat_optix.h
@@ -31,8 +31,12 @@
 #  define ATTR_FALLTHROUGH
 #endif
 
+#ifdef __CUDACC_RTC__
 typedef unsigned int uint32_t;
 typedef unsigned long long uint64_t;
+#else
+#  include <stdint.h>
+#endif
 typedef unsigned short half;
 typedef unsigned long long CUtexObject;