diff --git a/lib/common/fse_decompress.c b/lib/common/fse_decompress.c
index 6bcc6b20a..8e3f0035f 100644
--- a/lib/common/fse_decompress.c
+++ b/lib/common/fse_decompress.c
@@ -42,6 +42,7 @@
 #include "compiler.h"
 #define FSE_STATIC_LINKING_ONLY
 #include "fse.h"
+#include "error_private.h"
 
 
 /* **************************************************************
diff --git a/lib/compress/fse_compress.c b/lib/compress/fse_compress.c
index 50a130250..cc9fa7351 100644
--- a/lib/compress/fse_compress.c
+++ b/lib/compress/fse_compress.c
@@ -42,11 +42,13 @@
 #include "compiler.h"
 #define FSE_STATIC_LINKING_ONLY
 #include "fse.h"
+#include "error_private.h"
 
 
 /* **************************************************************
 *  Error Management
 ****************************************************************/
+#define FSE_isError ERR_isError
 #define FSE_STATIC_ASSERT(c) { enum { FSE_static_assert = 1/(int)(!!(c)) }; }   /* use only *after* variable declarations */
 
 
diff --git a/lib/compress/huf_compress.c b/lib/compress/huf_compress.c
index 953cb5f21..2a47c1820 100644
--- a/lib/compress/huf_compress.c
+++ b/lib/compress/huf_compress.c
@@ -50,11 +50,13 @@
 #include "fse.h"        /* header compression */
 #define HUF_STATIC_LINKING_ONLY
 #include "huf.h"
+#include "error_private.h"
 
 
 /* **************************************************************
 *  Error Management
 ****************************************************************/
+#define HUF_isError ERR_isError
 #define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; }   /* use only *after* variable declarations */
 #define CHECK_V_F(e, f) size_t const e = f; if (ERR_isError(e)) return e
 #define CHECK_F(f)   { CHECK_V_F(_var_err__, f); }
diff --git a/lib/decompress/huf_decompress.c b/lib/decompress/huf_decompress.c
index 6f6c3d4f0..79ded96bf 100644
--- a/lib/decompress/huf_decompress.c
+++ b/lib/decompress/huf_decompress.c
@@ -41,11 +41,13 @@
 #include "fse.h"        /* header compression */
 #define HUF_STATIC_LINKING_ONLY
 #include "huf.h"
+#include "error_private.h"
 
 
 /* **************************************************************
 *  Error Management
 ****************************************************************/
+#define HUF_isError ERR_isError
 #define HUF_STATIC_ASSERT(c) { enum { HUF_static_assert = 1/(int)(!!(c)) }; }   /* use only *after* variable declarations */