diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,6 +73,11 @@
     message(FATAL_ERROR "You are missing some Linux headers required to compile heaptrack.")
 endif()
 
+# cfree() does not exist in glibc 2.26+.
+# See: https://bugs.kde.org/show_bug.cgi?id=383889
+include(CheckSymbolExists)
+check_symbol_exists(cfree malloc.h HAVE_CFREE)
+
 set(BIN_INSTALL_DIR "bin")
 set(LIB_SUFFIX "" CACHE STRING "Define suffix of directory name (32/64)")
 set(LIB_INSTALL_DIR "lib${LIB_SUFFIX}")
diff --git a/src/track/heaptrack_inject.cpp b/src/track/heaptrack_inject.cpp
--- a/src/track/heaptrack_inject.cpp
+++ b/src/track/heaptrack_inject.cpp
@@ -17,6 +17,7 @@
  */
 
 #include "libheaptrack.h"
+#include "util/config.h"
 
 #include <cstdlib>
 #include <cstring>
@@ -42,12 +43,6 @@
 #error unsupported word size
 #endif
 
-#if defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || defined(__USE_MISC)
-#define HAVE_CFREE 1
-#else
-#define HAVE_CFREE 0
-#endif
-
 namespace {
 
 namespace Elf {
diff --git a/src/track/heaptrack_preload.cpp b/src/track/heaptrack_preload.cpp
--- a/src/track/heaptrack_preload.cpp
+++ b/src/track/heaptrack_preload.cpp
@@ -17,6 +17,7 @@
  */
 
 #include "libheaptrack.h"
+#include "util/config.h"
 
 #include <cstdio>
 #include <cstdlib>
@@ -33,11 +34,6 @@
 #else
 #  define HAVE_ALIGNED_ALLOC 0
 #endif
-#if defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || defined(__USE_MISC)
-#  define HAVE_CFREE 1
-#else
-#  define HAVE_CFREE 0
-#endif
 
 extern "C" {
 __attribute__((weak)) void __libc_freeres();
diff --git a/src/util/config.h.cmake b/src/util/config.h.cmake
--- a/src/util/config.h.cmake
+++ b/src/util/config.h.cmake
@@ -29,4 +29,8 @@
 
 #define HEAPTRACK_DEBUG_BUILD @HEAPTRACK_DEBUG_BUILD@
 
+// cfree() does not exist in glibc 2.26+.
+// See: https://bugs.kde.org/show_bug.cgi?id=383889
+#cmakedefine01 HAVE_CFREE
+
 #endif // HEAPTRACK_CONFIG_H
diff --git a/tests/manual/CMakeLists.txt b/tests/manual/CMakeLists.txt
--- a/tests/manual/CMakeLists.txt
+++ b/tests/manual/CMakeLists.txt
@@ -2,6 +2,10 @@
 
 add_executable(test_c test.c)
 add_executable(test_cpp test.cpp)
+set_target_properties(test_cpp PROPERTIES
+  INCLUDE_DIRECTORIES ${CMAKE_CURRENT_BINARY_DIR}/../../src/
+)
+
 add_executable(threaded threaded.cpp)
 target_link_libraries(threaded ${CMAKE_THREAD_LIBS_INIT})
 
diff --git a/tests/manual/test.cpp b/tests/manual/test.cpp
--- a/tests/manual/test.cpp
+++ b/tests/manual/test.cpp
@@ -19,6 +19,8 @@
 #include <cstdio>
 #include <cstdlib>
 
+#include "util/config.h"
+
 #if defined(_ISOC11_SOURCE)
 #  define HAVE_ALIGNED_ALLOC 1
 #else
@@ -82,7 +84,11 @@
 
     buf = calloc(5, 5);
     printf("calloc: %p\n", buf);
+#if HAVE_CFREE
     cfree(buf);
+#else
+    free(buf);
+#endif
 
 #if HAVE_ALIGNED_ALLOC
     buf = aligned_alloc(16, 160);