diff --git a/test-suite/standalone/test-asmobs-lib.c b/test-suite/standalone/test-asmobs-lib.c
index c88556ab2..03ac76447 100644
--- a/test-suite/standalone/test-asmobs-lib.c
+++ b/test-suite/standalone/test-asmobs-lib.c
@@ -16,7 +16,7 @@
  * 02110-1301 USA
  */
 
-#ifndef HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
diff --git a/test-suite/standalone/test-extensions-lib.c b/test-suite/standalone/test-extensions-lib.c
index 7c8678895..cc03a9eba 100644
--- a/test-suite/standalone/test-extensions-lib.c
+++ b/test-suite/standalone/test-extensions-lib.c
@@ -16,7 +16,7 @@
  * 02110-1301 USA
  */
 
-#ifndef HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
diff --git a/test-suite/standalone/test-ffi-lib.c b/test-suite/standalone/test-ffi-lib.c
index 364e6a684..a89b6aa94 100644
--- a/test-suite/standalone/test-ffi-lib.c
+++ b/test-suite/standalone/test-ffi-lib.c
@@ -16,7 +16,7 @@
  * 02110-1301 USA
  */
 
-#ifndef HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
diff --git a/test-suite/standalone/test-list.c b/test-suite/standalone/test-list.c
index 2efaf5c88..b51a2a18e 100644
--- a/test-suite/standalone/test-list.c
+++ b/test-suite/standalone/test-list.c
@@ -18,7 +18,7 @@
  * 02110-1301 USA
  */
 
-#ifndef HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
diff --git a/test-suite/standalone/test-num2integral.c b/test-suite/standalone/test-num2integral.c
index af995ecd8..6a44fb75a 100644
--- a/test-suite/standalone/test-num2integral.c
+++ b/test-suite/standalone/test-num2integral.c
@@ -16,7 +16,7 @@
  * 02110-1301 USA
  */
 
-#ifndef HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
diff --git a/test-suite/standalone/test-with-guile-module.c b/test-suite/standalone/test-with-guile-module.c
index 154f4f23f..4e22ff5da 100644
--- a/test-suite/standalone/test-with-guile-module.c
+++ b/test-suite/standalone/test-with-guile-module.c
@@ -16,7 +16,7 @@
  * 02110-1301 USA
  */
 
-#ifndef HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif