diff --git a/plugins/generators/simplexnoise/3rdparty/c-open-simplex/open-simplex-noise.h b/plugins/generators/simplexnoise/3rdparty/c-open-simplex/open-simplex-noise.h
index 460ce8fa45..5c767b744f 100644
--- a/plugins/generators/simplexnoise/3rdparty/c-open-simplex/open-simplex-noise.h
+++ b/plugins/generators/simplexnoise/3rdparty/c-open-simplex/open-simplex-noise.h
@@ -1,51 +1,53 @@
 #ifndef OPEN_SIMPLEX_NOISE_H__
 #define OPEN_SIMPLEX_NOISE_H__
 
 /*
  * OpenSimplex (Simplectic) Noise in C.
  * Ported to C from Kurt Spencer's java implementation by Stephen M. Cameron
  *
  * v1.1 (October 6, 2014) 
  * - Ported to C
  * 
  * v1.1 (October 5, 2014)
  * - Added 2D and 4D implementations.
  * - Proper gradient sets for all dimensions, from a
  *   dimensionally-generalizable scheme with an actual
  *   rhyme and reason behind it.
  * - Removed default permutation array in favor of
  *   default seed.
  * - Changed seed-based constructor to be independent
  *   of any particular randomization library, so results
  *   will be the same when ported to other languages.
  */
 
-#if ((__GNUC_STDC_INLINE__) || (__STDC_VERSION__ >= 199901L))
-	#include <stdint.h>
-	#define INLINE inline
+#if (defined (__STDC_VERSION__) || defined (__GNUC_STDC_INLINE__))
+    #if ((__GNUC_STDC_INLINE__) || (__STDC_VERSION__ >= 199901L))
+        #include <stdint.h>
+        #define INLINE inline
+    #endif
 #elif (defined (_MSC_VER) || defined (__GNUC_GNU_INLINE__))
 	#include <stdint.h>
 	#define INLINE __inline
 #else 
 	/* ANSI C doesn't have inline or stdint.h. */
 	#define INLINE
 #endif
 
 #ifdef __cplusplus
 	extern "C" {
 #endif
 
 struct osn_context;
 
 int open_simplex_noise(int64_t seed, struct osn_context **ctx);
 void open_simplex_noise_free(struct osn_context *ctx);
 int open_simplex_noise_init_perm(struct osn_context *ctx, int16_t p[], int nelements);
 double open_simplex_noise2(struct osn_context *ctx, double x, double y);
 double open_simplex_noise3(struct osn_context *ctx, double x, double y, double z);
 double open_simplex_noise4(struct osn_context *ctx, double x, double y, double z, double w);
 
 #ifdef __cplusplus
 	}
 #endif
 
 #endif