diff --git a/src/config/CMakeLists.txt b/src/config/CMakeLists.txt
--- a/src/config/CMakeLists.txt
+++ b/src/config/CMakeLists.txt
@@ -184,6 +184,20 @@
     }
 " HAVE_FUNC_ATTRIBUTE_DLLEXPORT)
 
+check_cxx_source_compiles("
+    // same as in src/util/system.cpp
+    #ifdef __linux__
+    #ifdef _POSIX_C_SOURCE
+    #undef _POSIX_C_SOURCE
+    #endif
+    #define _POSIX_C_SOURCE 200112L
+    #endif // __linux__
+    #include <fcntl.h>
+    int main() {
+        return posix_fallocate(0, 0, 0);
+    }
+" HAVE_POSIX_FALLOCATE)
+
 #__fdelt_chk's params and return type have changed from long unsigned int to
 # long int. See which one is present here.
 include(CheckPrototypeDefinition)
diff --git a/src/config/bitcoin-config.h.cmake.in b/src/config/bitcoin-config.h.cmake.in
--- a/src/config/bitcoin-config.h.cmake.in
+++ b/src/config/bitcoin-config.h.cmake.in
@@ -67,6 +67,7 @@
 
 #cmakedefine HAVE_FUNC_ATTRIBUTE_VISIBILITY 1
 #cmakedefine HAVE_FUNC_ATTRIBUTE_DLLEXPORT 1
+#cmakedefine HAVE_POSIX_FALLOCATE 1
 
 #cmakedefine ENABLE_BIP70 1
 #cmakedefine ENABLE_WALLET 1
diff --git a/src/util/system.cpp b/src/util/system.cpp
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -25,7 +25,8 @@
 #endif
 
 #ifndef WIN32
-// for posix_fallocate
+// for posix_fallocate, in config/CMakeLists.txt we check if it is present after
+// this
 #ifdef __linux__
 
 #ifdef _POSIX_C_SOURCE
@@ -1219,7 +1220,7 @@
         fcntl(fileno(file), F_PREALLOCATE, &fst);
     }
     ftruncate(fileno(file), static_cast<off_t>(offset) + length);
-#elif defined(__linux__)
+#elif defined(HAVE_POSIX_FALLOCATE)
     // Version using posix_fallocate
     off_t nEndPos = (off_t)offset + length;
     posix_fallocate(fileno(file), 0, nEndPos);