diff --git a/tests/common/test_common_main.c b/tests/common/test_common_main.c
index 37adaa3f..4ad60f34 100644
--- a/tests/common/test_common_main.c
+++ b/tests/common/test_common_main.c
@@ -3,6 +3,7 @@
 #include "config_ac.h"
 #endif
 
+#include <stdio.h>
 #include <stdlib.h>
 
 #include "log.h"
@@ -58,6 +59,9 @@ int main (void)
     struct log_config *lc = log_config_init_for_console(LOG_LEVEL_INFO, NULL);
     log_start_from_param(lc);
     log_config_free(lc);
+    /* Disable stdout buffering, as this can confuse the error
+     * reporting when running in libcheck fork mode */
+    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Initialise the ssl module */
     ssl_init();
diff --git a/tests/libipm/test_libipm_main.c b/tests/libipm/test_libipm_main.c
index 22f89508..b0933fae 100644
--- a/tests/libipm/test_libipm_main.c
+++ b/tests/libipm/test_libipm_main.c
@@ -3,6 +3,7 @@
 #include "config_ac.h"
 #endif
 
+#include <stdio.h>
 #include <stdlib.h>
 
 #include "log.h"
@@ -177,6 +178,9 @@ int main (void)
     struct log_config *lc = log_config_init_for_console(LOG_LEVEL_INFO, NULL);
     log_start_from_param(lc);
     log_config_free(lc);
+    /* Disable stdout buffering, as this can confuse the error
+     * reporting when running in libcheck fork mode */
+    setvbuf(stdout, NULL, _IONBF, 0);
 
     /* Initialise modules */
     suite_test_libipm_calls_start();
diff --git a/tests/libxrdp/test_libxrdp_main.c b/tests/libxrdp/test_libxrdp_main.c
index a2af4854..adfaca92 100644
--- a/tests/libxrdp/test_libxrdp_main.c
+++ b/tests/libxrdp/test_libxrdp_main.c
@@ -2,6 +2,7 @@
 #include "config_ac.h"
 #endif
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <check.h>
 #include "log.h"
@@ -22,6 +23,9 @@ int main (void)
     struct log_config *lc = log_config_init_for_console(LOG_LEVEL_INFO, NULL);
     log_start_from_param(lc);
     log_config_free(lc);
+    /* Disable stdout buffering, as this can confuse the error
+     * reporting when running in libcheck fork mode */
+    setvbuf(stdout, NULL, _IONBF, 0);
 
     srunner_run_all (sr, CK_ENV);
     number_failed = srunner_ntests_failed(sr);
diff --git a/tests/memtest/memtest.c b/tests/memtest/memtest.c
index 71268b13..561f75d0 100644
--- a/tests/memtest/memtest.c
+++ b/tests/memtest/memtest.c
@@ -26,6 +26,9 @@ int main(int argc, char **argv)
     config = log_config_init_for_console(LOG_LEVEL_DEBUG, NULL);
     log_start_from_param(config);
     log_config_free(config);
+    /* Disable stdout buffering, as this can confuse the error
+     * reporting when running in libcheck fork mode */
+    setvbuf(stdout, NULL, _IONBF, 0);
 
     srand(time(0));
     obj = libmem_init(0x80000000, 64 * 1024 * 1024);
diff --git a/tests/xrdp/test_xrdp_main.c b/tests/xrdp/test_xrdp_main.c
index 947c59b6..b0aaa12f 100644
--- a/tests/xrdp/test_xrdp_main.c
+++ b/tests/xrdp/test_xrdp_main.c
@@ -33,6 +33,7 @@
 
 #include "log.h"
 #include "os_calls.h"
+#include <stdio.h>
 #include <stdlib.h>
 
 #include "test_xrdp.h"
@@ -49,6 +50,9 @@ int main (void)
                                           g_getenv("TEST_LOG_LEVEL"));
     log_start_from_param(logging);
     log_config_free(logging);
+    /* Disable stdout buffering, as this can confuse the error
+     * reporting when running in libcheck fork mode */
+    setvbuf(stdout, NULL, _IONBF, 0);
 
     sr = srunner_create (make_suite_test_bitmap_load());
     srunner_add_suite(sr, make_suite_egfx_base_functions());