diff --git a/unit/test-common.c b/unit/test-common.c
index 37d06103..13a8430a 100644
--- a/unit/test-common.c
+++ b/unit/test-common.c
@@ -19,6 +19,10 @@
  *
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
diff --git a/unit/test-simutil.c b/unit/test-simutil.c
index adea9ecf..1c750964 100644
--- a/unit/test-simutil.c
+++ b/unit/test-simutil.c
@@ -19,6 +19,10 @@
  *
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <string.h>
 #include <stdio.h>
 #include <assert.h>
diff --git a/unit/test-sms.c b/unit/test-sms.c
index 52d68590..b5617b59 100644
--- a/unit/test-sms.c
+++ b/unit/test-sms.c
@@ -19,6 +19,10 @@
  *
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
diff --git a/unit/test-util.c b/unit/test-util.c
index cc96442c..42372de8 100644
--- a/unit/test-util.c
+++ b/unit/test-util.c
@@ -19,6 +19,10 @@
  *
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include <string.h>
 #include <stdio.h>
 #include <assert.h>