diff --git a/src/lstm/functions.cpp b/src/lstm/functions.cpp
index 25399ed4..ddd121d4 100644
--- a/src/lstm/functions.cpp
+++ b/src/lstm/functions.cpp
@@ -20,7 +20,7 @@
 
 namespace tesseract {
 
-#if __cplusplus < 201402 || defined(__clang__) // C++11
+#if __cplusplus < 201402 || defined(__clang__) || defined(__INTEL_COMPILER) // C++11
 
 double TanhTable[kTableSize];
 double LogisticTable[kTableSize];
diff --git a/src/lstm/functions.h b/src/lstm/functions.h
index 8ea6d687..d0f4f768 100644
--- a/src/lstm/functions.h
+++ b/src/lstm/functions.h
@@ -35,7 +35,7 @@ constexpr int kTableSize = 4096;
 // Scale factor for float arg to int index.
 constexpr double kScaleFactor = 256.0;
 
-#if __cplusplus < 201402 || defined(__clang__) // C++11
+#if __cplusplus < 201402 || defined(__clang__) || defined(__INTEL_COMPILER) // C++11
 
 extern double TanhTable[];
 extern double LogisticTable[];