diff --git a/lib/valueflow.cpp b/lib/valueflow.cpp
index 4de5e6460..31d366991 100644
--- a/lib/valueflow.cpp
+++ b/lib/valueflow.cpp
@@ -523,7 +523,7 @@ static void valueFlowAfterAssign(TokenList *tokenlist, ErrorLogger *errorLogger,
                 Token * const end   = start->link();
                 if (Token::findmatch(start, "%varid%", end, varid)) {
                     // TODO: don't check noreturn scopes
-                    if (number_of_if > 0U) {
+                    if (number_of_if > 0U || Token::findmatch(tok2, "%varid%", start, varid)) {
                         if (settings->debugwarnings)
                             bailout(tokenlist, errorLogger, tok2, "variable " + var->nameToken()->str() + " is assigned in conditional code");
                         break;
diff --git a/test/testvalueflow.cpp b/test/testvalueflow.cpp
index ba9776fc7..8f5a08795 100644
--- a/test/testvalueflow.cpp
+++ b/test/testvalueflow.cpp
@@ -594,6 +594,15 @@ private:
                "}";
         TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 4U, 32));
 
+        code = "void f() {\n" // #5656 - FP
+               "    int x = 0;\n"
+               "    if (!x) {\n"
+               "        x = getx();\n"
+               "    }\n"
+               "    y = x;\n"
+               "}";
+        ASSERT_EQUALS(false, testValueOfX(code, 6U, 0));
+
         // multivariables
         code = "void f(int a) {\n"
                "    int x = a;\n"