diff --git a/lib/valueflow.cpp b/lib/valueflow.cpp
index 167f6de48..3ade624d7 100644
--- a/lib/valueflow.cpp
+++ b/lib/valueflow.cpp
@@ -1203,7 +1203,7 @@ static void valueFlowSubFunction(TokenList *tokenlist, ErrorLogger *errorLogger,
         // passing value(s) to function
         if (Token::Match(tok, "[(,] %var% [,)]") && !tok->next()->values.empty())
             argvalues = tok->next()->values;
-        else if (Token::Match(tok, "[(,] %num% [,)]")) {
+        else if (Token::Match(tok, "[(,] %num% [,)]") && MathLib::isInt(tok->strAt(1))) {
             argvalues.clear();
             argvalues.push_back(ValueFlow::Value(MathLib::toLongNumber(tok->next()->str())));
         } else {
diff --git a/test/testvalueflow.cpp b/test/testvalueflow.cpp
index 352b56546..ac15c79f4 100644
--- a/test/testvalueflow.cpp
+++ b/test/testvalueflow.cpp
@@ -918,6 +918,13 @@ private:
                "void f2() { f1(0); }";
         ASSERT_EQUALS(true,  testValueOfX(code, 2U, 0));
         ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
+
+        // #5861 - fp with float
+        code = "void f1(float x) {\n"
+               "  return 1.0 / x;\n"
+               "}\n"
+               "void f2() { f1(0.5); }";
+        ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
     }
 };